diff --git a/modules/monitoring/library/Monitoring/Backend/Ido/Query/AllcontactsQuery.php b/modules/monitoring/library/Monitoring/Backend/Ido/Query/AllcontactsQuery.php
index 09779b66e..359872698 100644
--- a/modules/monitoring/library/Monitoring/Backend/Ido/Query/AllcontactsQuery.php
+++ b/modules/monitoring/library/Monitoring/Backend/Ido/Query/AllcontactsQuery.php
@@ -40,6 +40,7 @@ class AllcontactsQuery extends IdoQuery
 
     protected $contacts;
     protected $contactgroups;
+    protected $baseQuery;
     protected $useSubqueryCount = true;
 
     public function requireColumn($alias)