Fatal error: Uncaught TypeError: explode(): Argument #2 ($string) must be of type string, null given in /var/www/html/mount/app/vendor/hettich/pimcore-incubators/src/Hettich/Pimcore/IncubatorsBundle/Controller/DefaultController.php:2128 Stack trace: #0 /var/www/html/mount/app/vendor/hettich/pimcore-incubators/src/Hettich/Pimcore/IncubatorsBundle/Controller/DefaultController.php(2128): explode() #1 /var/www/html/mount/app/vendor/hettich/pimcore-incubators/src/Hettich/Pimcore/IncubatorsBundle/Controller/DefaultController.php(2070): Hettich\Pimcore\IncubatorsBundle\Controller\DefaultController->getUnavailableSlotsAboveAccessory() #2 /var/www/html/mount/app/vendor/hettich/pimcore-incubators/src/Hettich/Pimcore/IncubatorsBundle/Controller/DefaultController.php(438): Hettich\Pimcore\IncubatorsBundle\Controller\DefaultController->updateConfigurationAccessoriesMetadata() #3 /var/www/html/mount/app/vendor/symfony/http-kernel/HttpKernel.php(181): Hettich\Pimcore\IncubatorsBundle\Controller\DefaultController->configurationAction() #4 /var/www/html/mount/app/vendor/symfony/http-kernel/HttpKernel.php(76): Symfony\Component\HttpKernel\HttpKernel->handleRaw() #5 /var/www/html/mount/app/vendor/symfony/http-kernel/Kernel.php(197): Symfony\Component\HttpKernel\HttpKernel->handle() #6 /var/www/html/mount/app/public/index.php(36): Symfony\Component\HttpKernel\Kernel->handle() #7 {main} thrown in /var/www/html/mount/app/vendor/hettich/pimcore-incubators/src/Hettich/Pimcore/IncubatorsBundle/Controller/DefaultController.php on line 2128