diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 80873b1..96a29d9 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -19,9 +19,11 @@
 use Drupal\Core\Extension\ExtensionDiscovery;
 use Drupal\Core\DependencyInjection\ContainerBuilder;
 use Drupal\language\Entity\ConfigurableLanguage;
+use Symfony\Cmf\Component\Routing\RouteObjectInterface;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Route;
 
 use GuzzleHttp\Exception\RequestException;
 
@@ -416,6 +418,8 @@ function install_begin_request(&$install_state) {
 
   // Load all modules and perform request related initialization.
   $kernel->preHandle($request);
+  $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('<none>'));
+  $request->attributes->set(RouteObjectInterface::ROUTE_NAME, '<none>');
 
   // Prepare for themed output. We need to run this at the beginning of the
   // page request to avoid a different theme accidentally getting set. (We also