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Error: Call to a member function toUrl() on null in rdf_comment_storage_load() (line 245 of core/modules/rdf/rdf.module).
rdf_comment_storage_load() (Line: 818) Drupal\Core\Entity\ContentEntityStorageBase->invokeStorageLoadHook() (Line: 416) Drupal\Core\Entity\Sql\SqlContentEntityStorage->doLoadMultiple() (Line: 300) Drupal\Core\Entity\EntityStorageBase->loadMultiple() (Line: 188) Drupal\Core\Entity\EntityRepository->getCanonicalMultiple() (Line: 180) Drupal\Core\Entity\EntityRepository->getCanonical() (Line: 149) Drupal\Core\ParamConverter\EntityConverter->convert() (Line: 100) Drupal\Core\ParamConverter\ParamConverterManager->convert() (Line: 45) Drupal\Core\Routing\Enhancer\ParamConversionEnhancer->enhance() (Line: 260) Drupal\Core\Routing\Router->applyRouteEnhancers() (Line: 131) Drupal\Core\Routing\Router->matchRequest() (Line: 92) Drupal\Core\Routing\AccessAwareRouter->matchRequest() (Line: 113) Symfony\Component\HttpKernel\EventListener\RouterListener->onKernelRequest() call_user_func() (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 127) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 68) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 57) Drupal\Core\StackMiddleware\Session->handle() (Line: 47) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 191) Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 128) Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 82) Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 50) Drupal\ban\BanMiddleware->handle() (Line: 47) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 52) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 23) Stack\StackedHttpKernel->handle() (Line: 708) Drupal\Core\DrupalKernel->handle() (Line: 19)