Fatal error: Uncaught TypeError: TokyoClub\Utility::convertCase(): Argument #1 ($input) must be of type string, null given, called in /home/ntakeshi/class/EventCreateControllerForOrganizers.php on line 81 and defined in /home/ntakeshi/class/Utility.php:278
Stack trace:
#0 /home/ntakeshi/class/EventCreateControllerForOrganizers.php(81): TokyoClub\Utility::convertCase()
#1 /home/ntakeshi/www/mypage/bookings/temporary/index.php(24): TokyoClub\EventCreateControllerForOrganizers->buildQueryParameters()
#2 {main}
thrown in /home/ntakeshi/class/Utility.php on line 278