diff --git a/Listener/MaintenanceListener.php b/Listener/MaintenanceListener.php
index c84a947..013973b 100644
--- a/Listener/MaintenanceListener.php
+++ b/Listener/MaintenanceListener.php
@@ -194,7 +194,7 @@ public function onKernelRequest(GetResponseEvent $event)
         }
 
         $route = $request->get('_route');
-        if (null !== $this->route && preg_match('{'.$this->route.'}', $route)  || (true === $this->debug && '_' === $route[0])) {
+        if ($route === null || null !== $this->route && preg_match('{'.$this->route.'}', $route)  || (true === $this->debug && '_' === $route[0])) {
             return;
         }