Fatal error: Uncaught Error: Call to undefined function isset() in /web/app/system/Router.php:84
Stack trace:
#0 /web/app/system/Router.php(35): app\system\Router->getBrowserLocle()
#1 /web/public/index.php(20): app\system\Router->__construct()
#2 {main}
thrown in /web/app/system/Router.php on line 84