Fatal error: Uncaught TypeError: App\Service\PageList\PageListQueryParameters::isValid(): Argument #1 ($slug) must be of type string, null given, called in /srv/sylius/src/Controller/PageListController.php on line 266 and defined in /srv/sylius/src/Service/PageList/PageListQueryParameters.php:20 Stack trace: #0 /srv/sylius/src/Controller/PageListController.php(266): App\Service\PageList\PageListQueryParameters->isValid(NULL) #1 /srv/sylius/vendor/symfony/http-kernel/HttpKernel.php(181): App\Controller\PageListController->showAction(Object(Symfony\Component\HttpFoundation\Request)) #2 /srv/sylius/vendor/symfony/http-kernel/HttpKernel.php(76): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #3 /srv/sylius/vendor/symfony/http-kernel/Kernel.php(197): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #4 /srv/sylius/vendor/symfony/http-kernel/HttpCache/SubRequestHandler.php(86): Symfony\Component\HttpKernel\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #5 /srv/sylius/vendor/symfony/http-kernel/HttpCache/HttpCache.php(476): Symfony\Component\HttpKernel\HttpCache\SubRequestHandler::handle(Object(App\Kernel), Object(Symfony\Component\HttpFoundation\Request), 1, true) #6 /srv/sylius/vendor/symfony/framework-bundle/HttpCache/HttpCache.php(68): Symfony\Component\HttpKernel\HttpCache\HttpCache->forward(Object(Symfony\Component\HttpFoundation\Request), true, NULL) #7 /srv/sylius/vendor/symfony/http-kernel/HttpCache/HttpCache.php(451): Symfony\Bundle\FrameworkBundle\HttpCache\HttpCache->forward(Object(Symfony\Component\HttpFoundation\Request), true) #8 /srv/sylius/vendor/symfony/http-kernel/HttpCache/HttpCache.php(349): Symfony\Component\HttpKernel\HttpCache\HttpCache->fetch(Object(Symfony\Component\HttpFoundation\Request), true) #9 /srv/sylius/vendor/symfony/http-kernel/HttpCache/HttpCache.php(222): Symfony\Component\HttpKernel\HttpCache\HttpCache->lookup(Object(Symfony\Component\HttpFoundation\Request), true) #10 /srv/sylius/vendor/symfony/http-kernel/Kernel.php(188): Symfony\Component\HttpKernel\HttpCache\HttpCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #11 /srv/sylius/public/index.php(84): Symfony\Component\HttpKernel\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #12 {main} thrown in /srv/sylius/src/Service/PageList/PageListQueryParameters.php on line 20