diff --git a/src/android/org/linphone/BootReceiver.java b/src/android/org/linphone/BootReceiver.java
index 3ec7f2148..87e4fc84b 100644
--- a/src/android/org/linphone/BootReceiver.java
+++ b/src/android/org/linphone/BootReceiver.java
@@ -42,7 +42,11 @@ public class BootReceiver extends BroadcastReceiver {
 			if (autostart) {
 				Intent lLinphoneServiceIntent = new Intent(Intent.ACTION_MAIN);
 				lLinphoneServiceIntent.setClass(context, LinphoneService.class);
-				context.startService(lLinphoneServiceIntent);
+				try {
+					context.startService(lLinphoneServiceIntent);
+				} catch (RuntimeException e) {
+					Log.e(e);
+				}
 			}
 		}
 	}
diff --git a/src/android/org/linphone/LinphoneManager.java b/src/android/org/linphone/LinphoneManager.java
index d78212bf9..76e1267bb 100644
--- a/src/android/org/linphone/LinphoneManager.java
+++ b/src/android/org/linphone/LinphoneManager.java
@@ -1401,8 +1401,11 @@ public class LinphoneManager implements LinphoneCoreListener, LinphoneChatMessag
 						try {
 							if (mLc.getCallsNb() > 0) {
 								mLc.acceptCall(call);
-								LinphoneManager.getInstance().routeAudioToReceiver();
-								LinphoneActivity.instance().startIncallActivity(call);
+								if (LinphoneManager.getInstance() != null) {
+									LinphoneManager.getInstance().routeAudioToReceiver();
+									if (LinphoneActivity.instance() != null)
+										LinphoneActivity.instance().startIncallActivity(call);
+								}
 							}
 						} catch (LinphoneCoreException e) {
 							Log.e(e);
diff --git a/src/android/org/linphone/LinphoneUtils.java b/src/android/org/linphone/LinphoneUtils.java
index c189f47fc..02aa76f85 100644
--- a/src/android/org/linphone/LinphoneUtils.java
+++ b/src/android/org/linphone/LinphoneUtils.java
@@ -728,7 +728,7 @@ public final class LinphoneUtils {
 	}
 
 	public static void displayErrorAlert(String msg, Context ctxt) {
-		if (ctxt != null) {
+		if (ctxt != null && msg != null) {
 			AlertDialog.Builder builder = new AlertDialog.Builder(ctxt);
 			builder.setMessage(msg)
 					.setCancelable(false)
diff --git a/src/android/org/linphone/assistant/AssistantActivity.java b/src/android/org/linphone/assistant/AssistantActivity.java
index 90db60512..fc4127b4c 100644
--- a/src/android/org/linphone/assistant/AssistantActivity.java
+++ b/src/android/org/linphone/assistant/AssistantActivity.java
@@ -138,8 +138,10 @@ private static AssistantActivity instance;
         mPrefs = LinphonePreferences.instance();
 		status.enableSideMenu(false);
 
-		accountCreator = LinphoneCoreFactory.instance().createAccountCreator(LinphoneManager.getLc(), LinphonePreferences.instance().getXmlrpcUrl());
-		accountCreator.setListener(this);
+		if (LinphoneManager.getLcIfManagerNotDestroyedOrNull() != null) {
+			accountCreator = LinphoneCoreFactory.instance().createAccountCreator(LinphoneManager.getLc(), LinphonePreferences.instance().getXmlrpcUrl());
+			accountCreator.setListener(this);
+		}
 
 		countryListAdapter = new CountryListAdapter(getApplicationContext());
         mListener = new LinphoneCoreListenerBase() {