diff --git a/app/src/main/java/org/linphone/activities/assistant/fragments/AccountLoginFragment.kt b/app/src/main/java/org/linphone/activities/assistant/fragments/AccountLoginFragment.kt
index d114abf32..f7be7845a 100644
--- a/app/src/main/java/org/linphone/activities/assistant/fragments/AccountLoginFragment.kt
+++ b/app/src/main/java/org/linphone/activities/assistant/fragments/AccountLoginFragment.kt
@@ -46,10 +46,10 @@ class AccountLoginFragment : AbstractPhoneFragment<AssistantAccountLoginFragment
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedAssistantViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
-
+        }
+        
         viewModel = ViewModelProvider(this, AccountLoginViewModelFactory(sharedViewModel.getAccountCreator())).get(AccountLoginViewModel::class.java)
         binding.viewModel = viewModel
 
diff --git a/app/src/main/java/org/linphone/activities/assistant/fragments/EmailAccountCreationFragment.kt b/app/src/main/java/org/linphone/activities/assistant/fragments/EmailAccountCreationFragment.kt
index 2b62cf052..90a053247 100644
--- a/app/src/main/java/org/linphone/activities/assistant/fragments/EmailAccountCreationFragment.kt
+++ b/app/src/main/java/org/linphone/activities/assistant/fragments/EmailAccountCreationFragment.kt
@@ -40,9 +40,9 @@ class EmailAccountCreationFragment : GenericFragment<AssistantEmailAccountCreati
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedAssistantViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         viewModel = ViewModelProvider(this, EmailAccountCreationViewModelFactory(sharedViewModel.getAccountCreator())).get(EmailAccountCreationViewModel::class.java)
         binding.viewModel = viewModel
diff --git a/app/src/main/java/org/linphone/activities/assistant/fragments/EmailAccountValidationFragment.kt b/app/src/main/java/org/linphone/activities/assistant/fragments/EmailAccountValidationFragment.kt
index 3d0413305..92c6abcf5 100644
--- a/app/src/main/java/org/linphone/activities/assistant/fragments/EmailAccountValidationFragment.kt
+++ b/app/src/main/java/org/linphone/activities/assistant/fragments/EmailAccountValidationFragment.kt
@@ -38,9 +38,9 @@ class EmailAccountValidationFragment : GenericFragment<AssistantEmailAccountVali
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedAssistantViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         viewModel = ViewModelProvider(this, EmailAccountValidationViewModelFactory(sharedViewModel.getAccountCreator())).get(EmailAccountValidationViewModel::class.java)
         binding.viewModel = viewModel
diff --git a/app/src/main/java/org/linphone/activities/assistant/fragments/GenericAccountLoginFragment.kt b/app/src/main/java/org/linphone/activities/assistant/fragments/GenericAccountLoginFragment.kt
index 026752db8..5c5bbfb57 100644
--- a/app/src/main/java/org/linphone/activities/assistant/fragments/GenericAccountLoginFragment.kt
+++ b/app/src/main/java/org/linphone/activities/assistant/fragments/GenericAccountLoginFragment.kt
@@ -44,9 +44,9 @@ class GenericAccountLoginFragment : GenericFragment<AssistantGenericAccountLogin
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedAssistantViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         viewModel = ViewModelProvider(this, GenericLoginViewModelFactory(sharedViewModel.getAccountCreator(true))).get(GenericLoginViewModel::class.java)
         binding.viewModel = viewModel
diff --git a/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountCreationFragment.kt b/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountCreationFragment.kt
index 88a6b3eba..a0742b22d 100644
--- a/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountCreationFragment.kt
+++ b/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountCreationFragment.kt
@@ -39,9 +39,9 @@ class PhoneAccountCreationFragment : AbstractPhoneFragment<AssistantPhoneAccount
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedAssistantViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         viewModel = ViewModelProvider(this, PhoneAccountCreationViewModelFactory(sharedViewModel.getAccountCreator())).get(PhoneAccountCreationViewModel::class.java)
         binding.viewModel = viewModel
diff --git a/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountLinkingFragment.kt b/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountLinkingFragment.kt
index e88eddca9..9fc8b255a 100644
--- a/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountLinkingFragment.kt
+++ b/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountLinkingFragment.kt
@@ -40,9 +40,9 @@ class PhoneAccountLinkingFragment : AbstractPhoneFragment<AssistantPhoneAccountL
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedAssistantViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         val accountCreator = sharedViewModel.getAccountCreator()
         viewModel = ViewModelProvider(this, PhoneAccountLinkingViewModelFactory(accountCreator)).get(PhoneAccountLinkingViewModel::class.java)
diff --git a/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountValidationFragment.kt b/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountValidationFragment.kt
index c2498f20e..d72bdbf53 100644
--- a/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountValidationFragment.kt
+++ b/app/src/main/java/org/linphone/activities/assistant/fragments/PhoneAccountValidationFragment.kt
@@ -44,9 +44,9 @@ class PhoneAccountValidationFragment : GenericFragment<AssistantPhoneAccountVali
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedAssistantViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         viewModel = ViewModelProvider(this, PhoneAccountValidationViewModelFactory(sharedViewModel.getAccountCreator())).get(PhoneAccountValidationViewModel::class.java)
         binding.viewModel = viewModel
diff --git a/app/src/main/java/org/linphone/activities/assistant/fragments/QrCodeFragment.kt b/app/src/main/java/org/linphone/activities/assistant/fragments/QrCodeFragment.kt
index 7f2814c42..88bd1f9ba 100644
--- a/app/src/main/java/org/linphone/activities/assistant/fragments/QrCodeFragment.kt
+++ b/app/src/main/java/org/linphone/activities/assistant/fragments/QrCodeFragment.kt
@@ -43,9 +43,9 @@ class QrCodeFragment : GenericFragment<AssistantQrCodeFragmentBinding>() {
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedAssistantViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         viewModel = ViewModelProvider(this).get(QrCodeViewModel::class.java)
         binding.viewModel = viewModel
diff --git a/app/src/main/java/org/linphone/activities/assistant/fragments/RemoteProvisioningFragment.kt b/app/src/main/java/org/linphone/activities/assistant/fragments/RemoteProvisioningFragment.kt
index e1b489d16..ab3e74140 100644
--- a/app/src/main/java/org/linphone/activities/assistant/fragments/RemoteProvisioningFragment.kt
+++ b/app/src/main/java/org/linphone/activities/assistant/fragments/RemoteProvisioningFragment.kt
@@ -42,9 +42,9 @@ class RemoteProvisioningFragment : GenericFragment<AssistantRemoteProvisioningFr
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedAssistantViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         viewModel = ViewModelProvider(this).get(RemoteProvisioningViewModel::class.java)
         binding.viewModel = viewModel
diff --git a/app/src/main/java/org/linphone/activities/assistant/fragments/TopBarFragment.kt b/app/src/main/java/org/linphone/activities/assistant/fragments/TopBarFragment.kt
index f6d5941c3..67336a670 100644
--- a/app/src/main/java/org/linphone/activities/assistant/fragments/TopBarFragment.kt
+++ b/app/src/main/java/org/linphone/activities/assistant/fragments/TopBarFragment.kt
@@ -35,7 +35,8 @@ class TopBarFragment : GenericFragment<AssistantTopBarFragmentBinding>() {
 
         binding.setBackClickListener {
             if (!findNavController().popBackStack()) {
-                activity?.finish()
+                requireActivity().finish()
+                requireActivity().overridePendingTransition(R.anim.enter_left, R.anim.exit_right)
             }
         }
     }
diff --git a/app/src/main/java/org/linphone/activities/call/fragments/ControlsFragment.kt b/app/src/main/java/org/linphone/activities/call/fragments/ControlsFragment.kt
index 4ed3f65ca..dd2c04ebe 100644
--- a/app/src/main/java/org/linphone/activities/call/fragments/ControlsFragment.kt
+++ b/app/src/main/java/org/linphone/activities/call/fragments/ControlsFragment.kt
@@ -66,9 +66,9 @@ class ControlsFragment : GenericFragment<CallControlsFragmentBinding>() {
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedCallViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         callsViewModel = ViewModelProvider(this).get(CallsViewModel::class.java)
         binding.viewModel = callsViewModel
@@ -86,7 +86,7 @@ class ControlsFragment : GenericFragment<CallControlsFragmentBinding>() {
 
         callsViewModel.noMoreCallEvent.observe(viewLifecycleOwner, {
             it.consume {
-                activity?.finish()
+                requireActivity().finish()
             }
         })
 
diff --git a/app/src/main/java/org/linphone/activities/call/fragments/StatusFragment.kt b/app/src/main/java/org/linphone/activities/call/fragments/StatusFragment.kt
index c6237ce39..602ee7afe 100644
--- a/app/src/main/java/org/linphone/activities/call/fragments/StatusFragment.kt
+++ b/app/src/main/java/org/linphone/activities/call/fragments/StatusFragment.kt
@@ -49,9 +49,9 @@ class StatusFragment : GenericFragment<CallStatusFragmentBinding>() {
         viewModel = ViewModelProvider(this).get(StatusViewModel::class.java)
         binding.viewModel = viewModel
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedCallViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         binding.setStatsClickListener {
             sharedViewModel.toggleDrawerEvent.value = Event(true)
diff --git a/app/src/main/java/org/linphone/activities/launcher/LauncherActivity.kt b/app/src/main/java/org/linphone/activities/launcher/LauncherActivity.kt
index 96947e695..1e2624973 100644
--- a/app/src/main/java/org/linphone/activities/launcher/LauncherActivity.kt
+++ b/app/src/main/java/org/linphone/activities/launcher/LauncherActivity.kt
@@ -55,5 +55,6 @@ class LauncherActivity : GenericActivity() {
         intent.data = getIntent().data
 
         startActivity(intent)
+        overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out)
     }
 }
diff --git a/app/src/main/java/org/linphone/activities/main/chat/fragments/ChatRoomCreationFragment.kt b/app/src/main/java/org/linphone/activities/main/chat/fragments/ChatRoomCreationFragment.kt
index 9ea535e78..dc6296439 100644
--- a/app/src/main/java/org/linphone/activities/main/chat/fragments/ChatRoomCreationFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/chat/fragments/ChatRoomCreationFragment.kt
@@ -52,9 +52,9 @@ class ChatRoomCreationFragment : SecureFragment<ChatRoomCreationFragmentBinding>
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         val createGroup = arguments?.getBoolean("createGroup") ?: false
 
diff --git a/app/src/main/java/org/linphone/activities/main/chat/fragments/DetailChatRoomFragment.kt b/app/src/main/java/org/linphone/activities/main/chat/fragments/DetailChatRoomFragment.kt
index 28bb26571..2fa211892 100644
--- a/app/src/main/java/org/linphone/activities/main/chat/fragments/DetailChatRoomFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/chat/fragments/DetailChatRoomFragment.kt
@@ -89,9 +89,9 @@ class DetailChatRoomFragment : MasterFragment<ChatRoomDetailFragmentBinding, Cha
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         val chatRoom = sharedViewModel.selectedChatRoom.value
         chatRoom ?: return
diff --git a/app/src/main/java/org/linphone/activities/main/chat/fragments/DevicesFragment.kt b/app/src/main/java/org/linphone/activities/main/chat/fragments/DevicesFragment.kt
index 979e3b503..701069ae8 100644
--- a/app/src/main/java/org/linphone/activities/main/chat/fragments/DevicesFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/chat/fragments/DevicesFragment.kt
@@ -40,9 +40,9 @@ class DevicesFragment : SecureFragment<ChatRoomDevicesFragmentBinding>() {
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         val chatRoom = sharedViewModel.selectedChatRoom.value
         chatRoom ?: return
diff --git a/app/src/main/java/org/linphone/activities/main/chat/fragments/EphemeralFragment.kt b/app/src/main/java/org/linphone/activities/main/chat/fragments/EphemeralFragment.kt
index 647bb44a2..8cee2b818 100644
--- a/app/src/main/java/org/linphone/activities/main/chat/fragments/EphemeralFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/chat/fragments/EphemeralFragment.kt
@@ -43,9 +43,9 @@ class EphemeralFragment : SecureFragment<ChatRoomEphemeralFragmentBinding>() {
         isSecure = true
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         val chatRoom = sharedViewModel.selectedChatRoom.value
         chatRoom ?: return
diff --git a/app/src/main/java/org/linphone/activities/main/chat/fragments/GroupInfoFragment.kt b/app/src/main/java/org/linphone/activities/main/chat/fragments/GroupInfoFragment.kt
index 317b180ea..597585b0c 100644
--- a/app/src/main/java/org/linphone/activities/main/chat/fragments/GroupInfoFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/chat/fragments/GroupInfoFragment.kt
@@ -55,9 +55,9 @@ class GroupInfoFragment : SecureFragment<ChatRoomGroupInfoFragmentBinding>() {
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         val chatRoom: ChatRoom? = sharedViewModel.selectedGroupChatRoom.value
         isSecure = chatRoom?.currentParams?.encryptionEnabled() ?: false
diff --git a/app/src/main/java/org/linphone/activities/main/chat/fragments/ImdnFragment.kt b/app/src/main/java/org/linphone/activities/main/chat/fragments/ImdnFragment.kt
index fd83b3adb..6624d21b4 100644
--- a/app/src/main/java/org/linphone/activities/main/chat/fragments/ImdnFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/chat/fragments/ImdnFragment.kt
@@ -48,9 +48,9 @@ class ImdnFragment : SecureFragment<ChatRoomImdnFragmentBinding>() {
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         val chatRoom = sharedViewModel.selectedChatRoom.value
         chatRoom ?: return
diff --git a/app/src/main/java/org/linphone/activities/main/chat/fragments/MasterChatRoomsFragment.kt b/app/src/main/java/org/linphone/activities/main/chat/fragments/MasterChatRoomsFragment.kt
index 0602bf885..9906aa07a 100644
--- a/app/src/main/java/org/linphone/activities/main/chat/fragments/MasterChatRoomsFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/chat/fragments/MasterChatRoomsFragment.kt
@@ -79,9 +79,9 @@ class MasterChatRoomsFragment : MasterFragment<ChatRoomMasterFragmentBinding, Ch
         listViewModel = ViewModelProvider(this).get(ChatRoomsListViewModel::class.java)
         binding.viewModel = listViewModel
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         _adapter = ChatRoomsListAdapter(listSelectionViewModel, viewLifecycleOwner)
         // SubmitList is done on a background thread
diff --git a/app/src/main/java/org/linphone/activities/main/contact/fragments/ContactEditorFragment.kt b/app/src/main/java/org/linphone/activities/main/contact/fragments/ContactEditorFragment.kt
index 7c3b813d2..19426b14d 100644
--- a/app/src/main/java/org/linphone/activities/main/contact/fragments/ContactEditorFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/contact/fragments/ContactEditorFragment.kt
@@ -57,9 +57,9 @@ class ContactEditorFragment : GenericFragment<ContactEditorFragmentBinding>(), S
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         viewModel = ViewModelProvider(
             this,
diff --git a/app/src/main/java/org/linphone/activities/main/contact/fragments/DetailContactFragment.kt b/app/src/main/java/org/linphone/activities/main/contact/fragments/DetailContactFragment.kt
index 8accfaa28..6968039ed 100644
--- a/app/src/main/java/org/linphone/activities/main/contact/fragments/DetailContactFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/contact/fragments/DetailContactFragment.kt
@@ -52,9 +52,9 @@ class DetailContactFragment : GenericFragment<ContactDetailFragmentBinding>() {
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         val contact = sharedViewModel.selectedContact.value
         contact ?: return
diff --git a/app/src/main/java/org/linphone/activities/main/contact/fragments/MasterContactsFragment.kt b/app/src/main/java/org/linphone/activities/main/contact/fragments/MasterContactsFragment.kt
index 643251de8..e6f32d294 100644
--- a/app/src/main/java/org/linphone/activities/main/contact/fragments/MasterContactsFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/contact/fragments/MasterContactsFragment.kt
@@ -67,9 +67,9 @@ class MasterContactsFragment : MasterFragment<ContactMasterFragmentBinding, Cont
         listViewModel = ViewModelProvider(this).get(ContactsListViewModel::class.java)
         binding.viewModel = listViewModel
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         _adapter = ContactsListAdapter(listSelectionViewModel, viewLifecycleOwner)
         binding.contactsList.adapter = adapter
diff --git a/app/src/main/java/org/linphone/activities/main/dialer/fragments/DialerFragment.kt b/app/src/main/java/org/linphone/activities/main/dialer/fragments/DialerFragment.kt
index a15fd5ed1..f0fd28122 100644
--- a/app/src/main/java/org/linphone/activities/main/dialer/fragments/DialerFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/dialer/fragments/DialerFragment.kt
@@ -59,9 +59,9 @@ class DialerFragment : SecureFragment<DialerFragmentBinding>() {
         viewModel = ViewModelProvider(this).get(DialerViewModel::class.java)
         binding.viewModel = viewModel
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         binding.setNewContactClickListener {
             val deepLink = "linphone-android://contact/new/${viewModel.enteredUri.value}"
diff --git a/app/src/main/java/org/linphone/activities/main/fragments/StatusFragment.kt b/app/src/main/java/org/linphone/activities/main/fragments/StatusFragment.kt
index 5e250e043..40654baed 100644
--- a/app/src/main/java/org/linphone/activities/main/fragments/StatusFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/fragments/StatusFragment.kt
@@ -44,9 +44,9 @@ class StatusFragment : GenericFragment<StatusFragmentBinding>() {
         viewModel = ViewModelProvider(this).get(StatusViewModel::class.java)
         binding.viewModel = viewModel
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         sharedViewModel.proxyConfigRemoved.observe(viewLifecycleOwner, {
             Log.i("[Status Fragment] A proxy config was removed, update default proxy state")
diff --git a/app/src/main/java/org/linphone/activities/main/fragments/TabsFragment.kt b/app/src/main/java/org/linphone/activities/main/fragments/TabsFragment.kt
index e51d81a50..909628e78 100644
--- a/app/src/main/java/org/linphone/activities/main/fragments/TabsFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/fragments/TabsFragment.kt
@@ -49,9 +49,9 @@ class TabsFragment : GenericFragment<TabsFragmentBinding>(), NavController.OnDes
 
         binding.lifecycleOwner = this
 
-        viewModel = activity?.run {
+        viewModel = requireActivity().run {
             ViewModelProvider(this).get(TabsViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
         binding.viewModel = viewModel
 
         binding.setHistoryClickListener {
diff --git a/app/src/main/java/org/linphone/activities/main/history/fragments/DetailCallLogFragment.kt b/app/src/main/java/org/linphone/activities/main/history/fragments/DetailCallLogFragment.kt
index 46b7c4f50..7360eae53 100644
--- a/app/src/main/java/org/linphone/activities/main/history/fragments/DetailCallLogFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/history/fragments/DetailCallLogFragment.kt
@@ -48,9 +48,9 @@ class DetailCallLogFragment : GenericFragment<HistoryDetailFragmentBinding>() {
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         val callLogGroup = sharedViewModel.selectedCallLogGroup.value
         callLogGroup ?: return
diff --git a/app/src/main/java/org/linphone/activities/main/history/fragments/MasterCallLogsFragment.kt b/app/src/main/java/org/linphone/activities/main/history/fragments/MasterCallLogsFragment.kt
index 5d4fc3269..fc5293c58 100644
--- a/app/src/main/java/org/linphone/activities/main/history/fragments/MasterCallLogsFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/history/fragments/MasterCallLogsFragment.kt
@@ -71,9 +71,9 @@ class MasterCallLogsFragment : MasterFragment<HistoryMasterFragmentBinding, Call
         listViewModel = ViewModelProvider(this).get(CallLogsListViewModel::class.java)
         binding.viewModel = listViewModel
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         _adapter = CallLogsListAdapter(listSelectionViewModel, viewLifecycleOwner)
         // SubmitList is done on a background thread
@@ -196,10 +196,10 @@ class MasterCallLogsFragment : MasterFragment<HistoryMasterFragmentBinding, Call
         coreContext.core.resetMissedCallsCount()
         coreContext.notificationsManager.dismissMissedCallNotification()
 
-        val tabsViewModel = activity?.run {
+        val tabsViewModel = requireActivity().run {
             ViewModelProvider(this).get(TabsViewModel::class.java)
         }
-        tabsViewModel?.updateMissedCallCount()
+        tabsViewModel.updateMissedCallCount()
     }
 
     override fun getItemCount(): Int {
diff --git a/app/src/main/java/org/linphone/activities/main/settings/fragments/AccountSettingsFragment.kt b/app/src/main/java/org/linphone/activities/main/settings/fragments/AccountSettingsFragment.kt
index fbf75b6fa..9d600d8d7 100644
--- a/app/src/main/java/org/linphone/activities/main/settings/fragments/AccountSettingsFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/settings/fragments/AccountSettingsFragment.kt
@@ -43,9 +43,9 @@ class AccountSettingsFragment : GenericFragment<SettingsAccountFragmentBinding>(
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         val identity = arguments?.getString("Identity") ?: ""
         viewModel = ViewModelProvider(this, AccountSettingsViewModelFactory(identity)).get(AccountSettingsViewModel::class.java)
diff --git a/app/src/main/java/org/linphone/activities/main/settings/fragments/SettingsFragment.kt b/app/src/main/java/org/linphone/activities/main/settings/fragments/SettingsFragment.kt
index b4199fe51..9bd0a3c6b 100644
--- a/app/src/main/java/org/linphone/activities/main/settings/fragments/SettingsFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/settings/fragments/SettingsFragment.kt
@@ -45,9 +45,9 @@ class SettingsFragment : SecureFragment<SettingsFragmentBinding>() {
 
         binding.lifecycleOwner = this
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         viewModel = ViewModelProvider(this).get(SettingsViewModel::class.java)
         binding.viewModel = viewModel
diff --git a/app/src/main/java/org/linphone/activities/main/sidemenu/fragments/SideMenuFragment.kt b/app/src/main/java/org/linphone/activities/main/sidemenu/fragments/SideMenuFragment.kt
index 5dbba0e3b..a787f9912 100644
--- a/app/src/main/java/org/linphone/activities/main/sidemenu/fragments/SideMenuFragment.kt
+++ b/app/src/main/java/org/linphone/activities/main/sidemenu/fragments/SideMenuFragment.kt
@@ -62,9 +62,9 @@ class SideMenuFragment : GenericFragment<SideMenuFragmentBinding>() {
         viewModel = ViewModelProvider(this).get(SideMenuViewModel::class.java)
         binding.viewModel = viewModel
 
-        sharedViewModel = activity?.run {
+        sharedViewModel = requireActivity().run {
             ViewModelProvider(this).get(SharedMainViewModel::class.java)
-        } ?: throw Exception("Invalid Activity")
+        }
 
         sharedViewModel.proxyConfigRemoved.observe(viewLifecycleOwner, {
             Log.i("[Side Menu] Proxy config removed, update accounts list")
@@ -89,6 +89,7 @@ class SideMenuFragment : GenericFragment<SideMenuFragmentBinding>() {
         binding.setAssistantClickListener {
             sharedViewModel.toggleDrawerEvent.value = Event(true)
             startActivity(Intent(context, AssistantActivity::class.java))
+            requireActivity().overridePendingTransition(R.anim.enter_right, R.anim.exit_left)
         }
 
         binding.setSettingsClickListener {