diff --git a/plugins/ktcore/folder/Permissions.php b/plugins/ktcore/folder/Permissions.php
index 3e01c64..a82944b 100644
--- a/plugins/ktcore/folder/Permissions.php
+++ b/plugins/ktcore/folder/Permissions.php
@@ -165,6 +165,7 @@ class KTFolderPermissionsAction extends KTFolderAction {
         $aMapPermissionGroup = array();
         $aMapPermissionRole = array();
         $aMapPermissionUser = array();
+        $aActiveUsers = array();
 
         $aUsers = User::getList();