Fatal error: Uncaught TypeError: Argument 1 passed to logout() must be of the type string, null given, called in /var/www/vhosts/traintosmile.com/book/logout/index.php on line 26 and defined in /var/www/vhosts/traintosmile.com/book/include/func/logout.php:6 Stack trace: #0 /var/www/vhosts/traintosmile.com/book/logout/index.php(26): logout(NULL) #1 {main} thrown in /var/www/vhosts/traintosmile.com/book/include/func/logout.php on line 6