diff --git a/library/Icinga/Web/Navigation/NavigationItem.php b/library/Icinga/Web/Navigation/NavigationItem.php
index bb20db9e0..4a99fa295 100644
--- a/library/Icinga/Web/Navigation/NavigationItem.php
+++ b/library/Icinga/Web/Navigation/NavigationItem.php
@@ -446,7 +446,7 @@ class NavigationItem implements IteratorAggregate
     public function getUrl()
     {
         if ($this->url === null && $this->hasChildren()) {
-            return '#';
+            $this->setUrl(Url::fromPath('#'));
         }
 
         return $this->url;