diff --git a/include/class_plugin.inc b/include/class_plugin.inc
index 03690f9dea52dff3d09c661932ae7e8a91b2238e..cf0ab7041fe6e680c99ffd78702f925af2c52ec7 100644
--- a/include/class_plugin.inc
+++ b/include/class_plugin.inc
@@ -783,7 +783,7 @@ class plugin
 
     $array =
       array_map(
-        function ($a) use (&$cache, $depends, $forbidden)
+        function ($a) use (&$cache, $depends, $forbidden, $key)
         {
           if (in_array($a, $forbidden)) {
             msg_dialog::display(