Fatal error: Uncaught TypeError: Biblys\Service\Slug\SlugService::slugify(): Argument #1 ($input) must be of type string, null given, called in /home/biblys/cloud/scylla/inc/Collection.class.php on line 130 and defined in /home/biblys/cloud/scylla/src/Biblys/Service/Slug/SlugService.php:10 Stack trace: #0 /home/biblys/cloud/scylla/inc/Collection.class.php(130): Biblys\Service\Slug\SlugService->slugify(NULL) #1 /home/biblys/cloud/scylla/inc/functions.php(484): CollectionManager::createSlug('KOMIKKU', NULL) #2 /home/biblys/cloud/scylla/controllers/common/php/_list.php(293): collection_url('KOMIKKU', NULL) #3 /home/biblys/cloud/scylla/controllers/common/php/people.php(134): require_once('/home/biblys/cl...') #4 /home/biblys/cloud/scylla/src/AppBundle/Controller/LegacyController.php(87): AppBundle\Controller\LegacyController->{closure}(Object(Symfony\Component\HttpFoundation\Request), Object(Biblys\Service\CurrentSite), Object(Biblys\Service\CurrentUser), Object(Symfony\Component\Routing\Generator\UrlGenerator)) #5 /home/biblys/cloud/scylla/vendor/symfony/http-kernel/HttpKernel.php(169): AppBundle\Controller\LegacyController->defaultAction(Object(Symfony\Component\HttpFoundation\Request), Object(Symfony\Component\HttpFoundation\Session\Session), Object(Biblys\Service\Mailer), Object(Biblys\Service\Config), Object(Biblys\Service\CurrentSite), Object(Biblys\Service\CurrentUser), Object(Symfony\Component\Routing\Generator\UrlGenerator), Object(Biblys\Service\TemplateService), Object(Biblys\Service\MetaTagsService)) #6 /home/biblys/cloud/scylla/vendor/symfony/http-kernel/HttpKernel.php(81): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #7 /home/biblys/cloud/scylla/public/index.php(43): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #8 {main} thrown in /home/biblys/cloud/scylla/src/Biblys/Service/Slug/SlugService.php on line 10