public function regenerateID($deleteOldSession = false)
    {
        if ($this->getIsActive()) {
            // add @ to inhibit possible warning due to race condition
            // https://github.com/yiisoft/yii2/pull/1812
            if (YII_DEBUG && !headers_sent()) {
                session_regenerate_id($deleteOldSession);
            } else {
                @session_regenerate_id($deleteOldSession);
            }
        }
    }