Erreur 500 Internal Server Error

App\Controller\TicketController::checkIfCategoryFAQExistsInCategoriesUTAH(): Argument #1 ($faqCategorieCode) must be of type string, null given, called in /data/apache2/atexo-utah-prod.local-trust.com/htdocs/src/Controller/TicketController.php on line 312