Run start service on foreground

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

@@ -116,11 +116,16 @@ public class FragmentDialogSync extends FragmentDialogBase {
                                     db.endTransaction();
                                 }
 
-                                ServiceSynchronize.eval(context, "folder:months");
-
                                 return null;
                             }
 
+                            @Override
+                            protected void onExecuted(Bundle args, Void data) {
+                                Context context = getContext();
+                                if (context != null)
+                                    ServiceSynchronize.eval(context, "folder:months");
+                            }
+
                             @Override
                             protected void onException(Bundle args, Throwable ex) {
                                 Log.unexpectedError(getParentFragmentManager(), ex);