Fatal error: Uncaught TypeError: App\Repository\SystemKcRepository::fetch(): Argument #1 ($id) must be of type int, null given, called in /var/www/umimecesky.cz/webroot/src/Service/ExerciseService.php on line 32 and defined in /var/www/umimecesky.cz/webroot/src/Repository/SystemKcRepository.php:18 Stack trace: #0 /var/www/umimecesky.cz/webroot/src/Service/ExerciseService.php(32): App\Repository\SystemKcRepository->fetch() #1 /var/www/umimecesky.cz/webroot/src/Controller/BaseExercise.php(101): App\Service\ExerciseService->getExerciseData() #2 /var/www/umimecesky.cz/webroot/src/Web/Controller/Exercise/OtazkyExercise.php(38): App\Controller\BaseExercise->actionDefault() #3 /var/www/umimecesky.cz/webroot/exercise/noveOtazky.php(14): App\Web\Controller\Exercise\OtazkyExercise->actionDefault() #4 /var/www/umimecesky.cz/webroot/index.php(104): include('...') #5 {main} thrown in /var/www/umimecesky.cz/webroot/src/Repository/SystemKcRepository.php on line 18