Das ist noch im system/log
Code:
[2022-05-06T10:08:27.284212+02:00] request.CRITICAL: Uncaught PHP Exception TypeError: "Argument 9 passed to Contao\CoreBundle\Controller\BackendPreviewSwitchController::__construct() must be of the type string, null given, called in /homepages/46/xxx/htdocs/xxxxv3/var/cache/prod/ContainerNQ7ptzr/getBackendPreviewSwitchControllerService.php on line 22" at /homepages/46/xxx/htdocs/xxxx-v3/vendor/contao/core-bundle/src/Controller/BackendPreviewSwitchController.php line 53 {"exception":"[object] (TypeError(code: 0): Argument 9 passed to Contao\\CoreBundle\\Controller\\BackendPreviewSwitchController::__construct() must be of the type string, null given, called in /homepages/46/d346729057/htdocs/xxxx-v3/var/cache/prod/ContainerNQ7ptzr/getBackendPreviewSwitchControllerService.php on line 22 at /homepages/46/xxxx/htdocs/jagdbildungszentrum-v3/vendor/contao/core-bundle/src/Controller/BackendPreviewSwitchController.php:53)"} []