private static function maybe_import_users_from_csv()
 {
     if (isset($_FILES['user_import_csv'])) {
         check_admin_referer('displet_user_import_nonce');
         DispletRetsIdxLeadsController::import_users_from_csv($_FILES['user_import_csv']['tmp_name'], $_POST['user_import_email']);
         self::$_model['importing_users'] = true;
     }
 }