diff --git a/bureau/admin/adm_list.php b/bureau/admin/adm_list.php
index 4d66a1f3..a83933a6 100644
--- a/bureau/admin/adm_list.php
+++ b/bureau/admin/adm_list.php
@@ -44,6 +44,7 @@ $fields = array (
 );
 getFields($fields);
 
+if (empty($pattern)) $pattern="*";
 
 if ($short!=-1) {
   $mem->adminpref($short);