diff --git a/addons/website_sale/static/src/js/website_sale_utils.js b/addons/website_sale/static/src/js/website_sale_utils.js
index dfb5fa58320..e5139a21910 100644
--- a/addons/website_sale/static/src/js/website_sale_utils.js
+++ b/addons/website_sale/static/src/js/website_sale_utils.js
@@ -34,7 +34,7 @@ const cartHandlerMixin = {
             route: "/shop/cart/update_json",
             params: params,
         }).then(async data => {
-            if (data.cart_quantity !== parseInt($(".my_cart_quantity").text())) {
+            if (data.cart_quantity && (data.cart_quantity !== parseInt($(".my_cart_quantity").text()))) {
                 await animateClone($('header .o_wsale_my_cart').first(), this.$itemImgContainer, 25, 40);
                 updateCartNavBar(data);
             }