diff --git a/addons/website_sale/controllers/main.py b/addons/website_sale/controllers/main.py
index 37ddd182ca5..401ad96f511 100644
--- a/addons/website_sale/controllers/main.py
+++ b/addons/website_sale/controllers/main.py
@@ -539,7 +539,7 @@ class WebsiteSale(http.Controller):
             except ValidationError:
                 error["vat"] = 'error'
 
-        if [err for err in error.items() if err == 'missing']:
+        if [err for err in error.values() if err == 'missing']:
             error_message.append(_('Some required fields are empty.'))
 
         return error, error_message