diff --git a/application/modules/auth/models/GroupModel.php b/application/modules/auth/models/GroupModel.php
index e25593dfd8bb29a9dbd1a9aeb86cbca30a256b6b..0470412bf5aeb947337d40f98c4c37452d05c198 100644
--- a/application/modules/auth/models/GroupModel.php
+++ b/application/modules/auth/models/GroupModel.php
@@ -163,7 +163,7 @@ class Auth_GroupModel extends Unl_Model
             }
             $select->where('childGroup IN(?)', $group->getId());
         } else {
-            $select->where('childGroup = ?', $group->getId());
+            $select->where($db->quoteInto('childGroup = ?', $group->getId()));
         }
         
         $records = $select->query()->fetchAll();