public static function checkBrowserRobot()
    {
        if (stripos(self::$userAgentString, 'bot') !== false ||
            stripos(self::$userAgentString, 'spider') !== false ||
            stripos(self::$userAgentString, 'crawler') !== false
        ) {
            self::$browser->setIsRobot(true);

            return true;
        }

        return false;
    }