diff --git a/action.defaultadmin.php b/action.defaultadmin.php
index beac39144b74f1f41a68f64913fcdd8df9ab9ecf..2755e1575a0290f90365109aec8ba8d292989019 100644
--- a/action.defaultadmin.php
+++ b/action.defaultadmin.php
@@ -83,7 +83,7 @@ $place = $this->CreateInputSelectList($id, $name, $groupNames,
      $selected, 10, '', false);
 $smarty->assign('selectgroup',$place);
 
-$formValues = array(); $hiddenParameters = '';
+$formValues = array(); $hiddenParameters = array();
 foreach ($params as $key => $value) {
   if ($key == 'search' || $key == 'action') continue;
   if ($key == 'Grupp' && $value == 'None') continue;