diff --git a/Neos.Neos/Classes/FrontendRouting/EventSourcedFrontendNodeRoutePartHandler.php b/Neos.Neos/Classes/FrontendRouting/EventSourcedFrontendNodeRoutePartHandler.php
index 56f414cbf53..d2d592f61fa 100644
--- a/Neos.Neos/Classes/FrontendRouting/EventSourcedFrontendNodeRoutePartHandler.php
+++ b/Neos.Neos/Classes/FrontendRouting/EventSourcedFrontendNodeRoutePartHandler.php
@@ -34,6 +34,7 @@
 use Neos\Neos\FrontendRouting\DimensionResolution\DelegatingResolver;
 use Neos\Neos\FrontendRouting\DimensionResolution\RequestToDimensionSpacePointContext;
 use Neos\Neos\FrontendRouting\DimensionResolution\DimensionResolverInterface;
+use Neos\Neos\FrontendRouting\SiteDetection\SiteDetectionFailedException;
 use Neos\Neos\FrontendRouting\SiteDetection\SiteDetectionMiddleware;
 use Neos\Neos\FrontendRouting\SiteDetection\SiteDetectionResult;
 use Psr\Http\Message\UriInterface;
@@ -175,7 +176,11 @@ public function matchWithParameters(&$requestPath, RouteParameters $parameters)
             return false;
         }
 
-        $siteDetectionResult = SiteDetectionResult::fromRouteParameters($parameters);
+        try {
+            $siteDetectionResult = SiteDetectionResult::fromRouteParameters($parameters);
+        } catch (SiteDetectionFailedException) {
+            return false;
+        }
         $resolvedSite = $this->siteRepository->findOneByNodeName($siteDetectionResult->siteNodeName);
 
         if ($resolvedSite === null) {
@@ -196,7 +201,6 @@ public function matchWithParameters(&$requestPath, RouteParameters $parameters)
         // TODO validate dsp == complete (ContentDimensionZookeeper::getAllowedDimensionSubspace()->contains()...)
         // if incomplete -> no match + log
 
-        $siteDetectionResult = SiteDetectionResult::fromRouteParameters($parameters);
         $contentRepository = $this->contentRepositoryRegistry->get($siteDetectionResult->contentRepositoryId);
 
         try {
diff --git a/Neos.Neos/Classes/Service/EditorContentStreamZookeeper.php b/Neos.Neos/Classes/Service/EditorContentStreamZookeeper.php
index 2d1095bfe41..8ee55645c69 100644
--- a/Neos.Neos/Classes/Service/EditorContentStreamZookeeper.php
+++ b/Neos.Neos/Classes/Service/EditorContentStreamZookeeper.php
@@ -34,6 +34,7 @@
 use Neos\Flow\Security\Policy\Role;
 use Neos\Neos\Domain\Model\User;
 use Neos\Neos\Domain\Service\WorkspaceNameBuilder;
+use Neos\Neos\FrontendRouting\SiteDetection\SiteDetectionFailedException;
 use Neos\Neos\FrontendRouting\SiteDetection\SiteDetectionResult;
 use Neos\Party\Domain\Service\PartyService;
 
@@ -95,7 +96,11 @@ public function relayEditorAuthentication(Authentication\TokenInterface $token):
             // we might be in testing context
             return;
         }
-        $siteDetectionResult = SiteDetectionResult::fromRequest($requestHandler->getHttpRequest());
+        try {
+            $siteDetectionResult = SiteDetectionResult::fromRequest($requestHandler->getHttpRequest());
+        } catch (SiteDetectionFailedException) {
+            return;
+        }
         $contentRepository = $this->contentRepositoryRegistry->get($siteDetectionResult->contentRepositoryId);
 
         $isEditor = false;
@@ -131,8 +136,10 @@ public function relayEditorAuthentication(Authentication\TokenInterface $token):
             return;
         }
 
-        /** @var Workspace $baseWorkspace */
         $baseWorkspace = $contentRepository->getWorkspaceFinder()->findOneByName(WorkspaceName::forLive());
+        if (!$baseWorkspace) {
+            return;
+        }
         $editorsNewContentStreamId = ContentStreamId::create();
         $contentRepository->handle(
             CreateWorkspace::create(