Fatal error: Uncaught TypeError: mb_substr(): Argument #1 ($string) must be of type string, null given in /var/www/html/include/php/Pages/Public/User.php:52 Stack trace: #0 /var/www/html/include/php/Pages/Public/User.php(52): mb_substr(NULL, 0, 1000) #1 /var/www/html/include/php/Router.php(81): App\Pages\Public\User->__construct() #2 /var/www/html/index.php(108): App\Router->match('GET', '/crony', 'App\\Pages\\Publi...') #3 /var/www/html/include/php/Router.php(31): {closure}(Object(App\Router)) #4 /var/www/html/index.php(102): App\Router->group('', Object(Closure), Object(Closure), Object(Closure)) #5 {main} thrown in /var/www/html/include/php/Pages/Public/User.php on line 52