Prevent crash

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

@@ -82,10 +82,12 @@ public class BoundaryCallbackMessages extends PagedList.BoundaryCallback<TupleMe
     }
 
     private void load() {
-        if (model != null)
         executor.submit(new Runnable() {
             @Override
             public void run() {
+                if (model == null)
+                    return;
+
                 try {
                     searching = model.isSearching();
                     handler.post(new Runnable() {