diff --git a/addons/website/models/ir_actions.py b/addons/website/models/ir_actions.py
index 1b469adfc05..f186c421b9f 100644
--- a/addons/website/models/ir_actions.py
+++ b/addons/website/models/ir_actions.py
@@ -44,7 +44,7 @@ class actions_server(osv.Model):
 
     def on_change_website_path(self, cr, uid, ids, website_path, xml_id, context=None):
         values = {
-            'website_url': self._compute_website_url(cr, uid, ids[0], website_path, xml_id, context=context)
+            'website_url': self._compute_website_url(cr, uid, ids and ids[0] or None, website_path, xml_id, context=context)
         }
         return {'value': values}