diff --git a/addons/website_mail/models/email_template.py b/addons/website_mail/models/email_template.py
index 9a8c56b46fa..f6cf51b8778 100644
--- a/addons/website_mail/models/email_template.py
+++ b/addons/website_mail/models/email_template.py
@@ -10,7 +10,12 @@ class EmailTemplate(osv.Model):
     def action_edit_html(self, cr, uid, ids, context=None):
         if not len(ids) == 1:
             raise ValueError('One and only one ID allowed for this action')
-        url = '/website_mail/email_designer?model=email.template&res_id=%d&return_action=%d&enable_editor=1' % (ids[0], context['params']['action'])
+        if not context.get('params'):
+            action_id = self.pool['ir.model.data'].xmlid_to_res_id(cr, uid, 'mass_mailing.action_email_template_marketing')
+        else:
+            action_id = context['params']['action']
+
+        url = '/website_mail/email_designer?model=email.template&res_id=%d&return_action=%d&enable_editor=1' % (ids[0], action_id)
         return {
             'name': _('Edit Template'),
             'type': 'ir.actions.act_url',