Prevent crash

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -168,7 +168,8 @@ public class ServiceSynchronize extends ServiceBase {
         Map<Long, List<Long>> groupNotifying = new HashMap<>();
 
         // Get existing notifications
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
+            try {
                 NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
                 for (StatusBarNotification sbn : nm.getActiveNotifications()) {
                     String tag = sbn.getTag();
@@ -186,6 +187,17 @@ public class ServiceSynchronize extends ServiceBase {
                         }
                     }
                 }
+            } catch (Throwable ex) {
+                Log.w(ex);
+                /*
+                    java.lang.RuntimeException: Unable to create service eu.faircode.email.ServiceSynchronize: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List android.content.pm.ParceledListSlice.getList()' on a null object reference
+                            at android.app.ActivityThread.handleCreateService(ActivityThread.java:2944)
+                            at android.app.ActivityThread.access$1900(ActivityThread.java:154)
+                            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1474)
+                            at android.os.Handler.dispatchMessage(Handler.java:102)
+                            at android.os.Looper.loop(Looper.java:234)
+                            at android.app.ActivityThread.main(ActivityThread.java:5526)
+                */
             }
 
         db.message().liveUnseenNotify().observe(cowner, new Observer<List<TupleMessageEx>>() {