Null check current user. Fixes 1 part of https://github.com/austinhuang0131/barinsta/issues/816

app/src/main/java/awais/instagrabber/viewmodels/DirectThreadViewModel.java

@@ -279,6 +279,7 @@ public class DirectThreadViewModel extends AndroidViewModel {
     }
 
     public void markAsSeen() {
+        if (currentUser == null) return;
         final DirectThread thread = getThread().getValue();
         if (thread == null) return;
         final List<DirectItem> items = thread.getItems();