diff --git a/app/src/main/java/org/linphone/LinphoneContext.java b/app/src/main/java/org/linphone/LinphoneContext.java
index 30442ac61..61ea0ed2e 100644
--- a/app/src/main/java/org/linphone/LinphoneContext.java
+++ b/app/src/main/java/org/linphone/LinphoneContext.java
@@ -90,6 +90,9 @@ public class LinphoneContext {
     }
 
     public static LinphoneContext instance() {
+        if (sInstance == null) {
+            throw new RuntimeException("[Context] Linphone Context not available!");
+        }
         return sInstance;
     }
 
diff --git a/app/src/main/java/org/linphone/activities/LinphoneLauncherActivity.java b/app/src/main/java/org/linphone/activities/LinphoneLauncherActivity.java
index dda3c0cef..22a10fc3a 100644
--- a/app/src/main/java/org/linphone/activities/LinphoneLauncherActivity.java
+++ b/app/src/main/java/org/linphone/activities/LinphoneLauncherActivity.java
@@ -23,6 +23,7 @@ import android.app.Activity;
 import android.content.Intent;
 import android.content.pm.ActivityInfo;
 import android.os.Bundle;
+import android.util.Log;
 import org.linphone.LinphoneManager;
 import org.linphone.R;
 import org.linphone.assistant.MenuAssistantActivity;
@@ -57,9 +58,14 @@ public class LinphoneLauncherActivity extends Activity implements ServiceWaitThr
         if (LinphoneService.isReady()) {
             onServiceReady();
         } else {
-            startService(
-                    new Intent().setClass(LinphoneLauncherActivity.this, LinphoneService.class));
-            new ServiceWaitThread(this).start();
+            try {
+                startService(
+                        new Intent()
+                                .setClass(LinphoneLauncherActivity.this, LinphoneService.class));
+                new ServiceWaitThread(this).start();
+            } catch (IllegalStateException ise) {
+                Log.e("Linphone", "Exception raised while starting service: " + ise);
+            }
         }
     }
 
diff --git a/app/src/main/java/org/linphone/call/CallActivity.java b/app/src/main/java/org/linphone/call/CallActivity.java
index f96e95d92..fa84846ba 100644
--- a/app/src/main/java/org/linphone/call/CallActivity.java
+++ b/app/src/main/java/org/linphone/call/CallActivity.java
@@ -49,6 +49,7 @@ import androidx.core.content.ContextCompat;
 import androidx.drawerlayout.widget.DrawerLayout;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
+import org.linphone.LinphoneContext;
 import org.linphone.LinphoneManager;
 import org.linphone.R;
 import org.linphone.activities.LinphoneGenericActivity;
@@ -94,6 +95,8 @@ public class CallActivity extends LinphoneGenericActivity
         @Override
         public void run() {
             // Make sure that at the time this is executed this is still required
+            if (!LinphoneContext.isReady()) return;
+
             Call call = LinphoneManager.getCore().getCurrentCall();
             if (call != null && call.getCurrentParams().videoEnabled()) {
                 CallActivity activity = mWeakCallActivity.get();
diff --git a/app/src/main/java/org/linphone/settings/AudioSettingsFragment.java b/app/src/main/java/org/linphone/settings/AudioSettingsFragment.java
index 06abc909f..0e6036c88 100644
--- a/app/src/main/java/org/linphone/settings/AudioSettingsFragment.java
+++ b/app/src/main/java/org/linphone/settings/AudioSettingsFragment.java
@@ -36,6 +36,7 @@ import org.linphone.core.Core;
 import org.linphone.core.CoreListenerStub;
 import org.linphone.core.EcCalibratorStatus;
 import org.linphone.core.PayloadType;
+import org.linphone.core.tools.Log;
 import org.linphone.settings.widget.BasicSetting;
 import org.linphone.settings.widget.ListSetting;
 import org.linphone.settings.widget.SettingListenerBase;
@@ -113,7 +114,11 @@ public class AudioSettingsFragment extends SettingsFragment {
                 new SettingListenerBase() {
                     @Override
                     public void onTextValueChanged(String newValue) {
-                        mPrefs.setMicGainDb(Float.valueOf(newValue));
+                        try {
+                            mPrefs.setMicGainDb(Float.valueOf(newValue));
+                        } catch (NumberFormatException nfe) {
+                            Log.e("Can't set mic gain, number format exception: " + nfe);
+                        }
                     }
                 });
 
@@ -121,7 +126,11 @@ public class AudioSettingsFragment extends SettingsFragment {
                 new SettingListenerBase() {
                     @Override
                     public void onTextValueChanged(String newValue) {
-                        mPrefs.setPlaybackGainDb(Float.valueOf(newValue));
+                        try {
+                            mPrefs.setPlaybackGainDb(Float.valueOf(newValue));
+                        } catch (NumberFormatException nfe) {
+                            Log.e("Can't set speaker gain, number format exception: " + nfe);
+                        }
                     }
                 });
 
@@ -129,14 +138,18 @@ public class AudioSettingsFragment extends SettingsFragment {
                 new SettingListenerBase() {
                     @Override
                     public void onListValueChanged(int position, String newLabel, String newValue) {
-                        int bitrate = Integer.valueOf(newValue);
-                        mPrefs.setCodecBitrateLimit(bitrate);
+                        try {
+                            int bitrate = Integer.valueOf(newValue);
+                            mPrefs.setCodecBitrateLimit(bitrate);
 
-                        Core core = LinphoneManager.getCore();
-                        for (final PayloadType pt : core.getAudioPayloadTypes()) {
-                            if (pt.isVbr()) {
-                                pt.setNormalBitrate(bitrate);
+                            Core core = LinphoneManager.getCore();
+                            for (final PayloadType pt : core.getAudioPayloadTypes()) {
+                                if (pt.isVbr()) {
+                                    pt.setNormalBitrate(bitrate);
+                                }
                             }
+                        } catch (NumberFormatException nfe) {
+                            Log.e("Can't set codec bitrate limit, number format exception: " + nfe);
                         }
                     }
                 });
diff --git a/app/src/main/java/org/linphone/utils/LinphoneUtils.java b/app/src/main/java/org/linphone/utils/LinphoneUtils.java
index 00331576d..7b56ac38f 100644
--- a/app/src/main/java/org/linphone/utils/LinphoneUtils.java
+++ b/app/src/main/java/org/linphone/utils/LinphoneUtils.java
@@ -245,20 +245,24 @@ public final class LinphoneUtils {
         }
 
         if (username.contains("@")) {
-            String domain = username.split("@")[1];
-            ProxyConfig lpc = core.getDefaultProxyConfig();
-            if (lpc != null) {
-                if (domain.equals(lpc.getDomain())) {
-                    return username.split("@")[0];
-                }
-            } else {
-                if (domain.equals(
-                        LinphoneContext.instance()
-                                .getApplicationContext()
-                                .getString(R.string.default_domain))) {
-                    return username.split("@")[0];
+            String[] split = username.split("@");
+            if (split.length > 1) {
+                String domain = split[1];
+                ProxyConfig lpc = core.getDefaultProxyConfig();
+                if (lpc != null) {
+                    if (domain.equals(lpc.getDomain())) {
+                        return split[0];
+                    }
+                } else {
+                    if (domain.equals(
+                            LinphoneContext.instance()
+                                    .getApplicationContext()
+                                    .getString(R.string.default_domain))) {
+                        return split[0];
+                    }
                 }
             }
+            return split[0];
         }
         return username;
     }