diff --git a/htdocs/admin/const.php b/htdocs/admin/const.php
index 7588bdf5241..ae4b9eb35dd 100644
--- a/htdocs/admin/const.php
+++ b/htdocs/admin/const.php
@@ -49,7 +49,7 @@ $constnote=GETPOST('constnote','alpha');
  * Actions
  */
 
-if ($action == 'add' || GETPOST('add'))
+if ($action == 'add' || (GETPOST('add') && $action != 'update'))
 {
 	$error=0;