diff --git a/bundle/View/Builder/TagViewBuilder.php b/bundle/View/Builder/TagViewBuilder.php
index 014138cb..c527082b 100644
--- a/bundle/View/Builder/TagViewBuilder.php
+++ b/bundle/View/Builder/TagViewBuilder.php
@@ -73,7 +73,7 @@ public function __construct(
      */
     public function matches($argument)
     {
-        return strpos($argument, 'eztags.controller.tag_view:') !== false;
+        return is_string($argument) && strpos($argument, 'eztags.controller.tag_view:') !== false;
     }
 
     /**