Run start service on foreground

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

@@ -506,11 +506,16 @@ public class FragmentOptionsSynchronize extends FragmentBase implements SharedPr
                         DB db = DB.getInstance(context);
                         db.account().setAccountPollExempted(id, exempted);
 
-                        ServiceSynchronize.eval(context, "exempted");
-
                         return null;
                     }
 
+                    @Override
+                    protected void onExecuted(Bundle args, Void data) {
+                        Context context = getContext();
+                        if (context != null)
+                            ServiceSynchronize.eval(context, "exempted");
+                    }
+
                     @Override
                     protected void onException(Bundle args, Throwable ex) {
                         Log.e(ex);