diff --git a/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php b/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php
index d39effc0f..a38371c19 100644
--- a/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php
+++ b/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php
@@ -890,7 +890,7 @@ abstract class IdoQuery extends DbQuery
      */
     protected function joinHookedVirtualTable($table)
     {
-        $this->hookedVirtualTable[$table]->joinVirtualTable($table);
+        $this->hookedVirtualTables[$table]->joinVirtualTable($table);
         $this->joinedVirtualTables[$table] = true;
         return $this;
     }