Access denied with popups when adding an added friend

Adding an added friend or remove a removed friend should not be possible. It is especially when using the popupsapi module.
I Quickly fixed the code and could be patched.
In frienlist_ui.module around line 170:

  // Check that the user is allowed the requested operation.
  $allowed = friendlist_api_relation_allowed_op($op, $user, $account, $rtid);
  if (!$allowed) {
    // Start patching code by stalski/zuuperman
    $message = '';
    switch($op) {
      case 'delete':
        $message = t('You and '.$account->name.' are not '.$rt->name_p.' yet.');
        break;
      case 'add':
        $message = t('You and '.$account->name.' are already '.$rt->name_p.'.');
        break;
      default:
      $message = drupal_access_denied();
    }
    return $message;
  }

For me this works as the name friend, fan or follower (as relation types) get the correct message.