diff --git a/addons/website_sale_comparison/controllers/main.py b/addons/website_sale_comparison/controllers/main.py
index 18c98f639e2..24edf750d49 100644
--- a/addons/website_sale_comparison/controllers/main.py
+++ b/addons/website_sale_comparison/controllers/main.py
@@ -26,7 +26,8 @@ class WebsiteSaleProductComparison(WebsiteSale):
                     continue
                 res.setdefault(cat_name, {}).setdefault(att_name, [' - '] * len(products))
                 val = product.attribute_value_ids.filtered(lambda x: x.attribute_id == var.attribute_id)
-                res[cat_name][att_name][num] = val[0].name
+                if val:
+                    res[cat_name][att_name][num] = val[0].name
         values['specs'] = res
         values['compute_currency'] = self._get_compute_currency_and_context()[0]
         return request.render("website_sale_comparison.product_compare", values)