Fix cart quantity for bundled items

Author: bookernath

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Draft
 - Fixes body text color not taking effect for cart item headings on mobile / tablet [#1586](https://github.com/bigcommerce/cornerstone/pull/1586)
 - Fix styling of review modal image [#1592](https://github.com/bigcommerce/cornerstone/pull/1592)
+- Fix cart quantity calculation for bundled products [#1596](https://github.com/bigcommerce/cornerstone/pull/1596)
 
 ## 4.2.1 (2019-10-15)
 - Added missing gift certificate translation

assets/js/theme/global/cart-preview.js

@@ -67,7 +67,7 @@ export default function (secureBaseUrl, cartId) {
 
         // Get updated cart quantity from the Cart API
         const cartQtyPromise = new Promise((resolve, reject) => {
-            utils.api.cart.getCartQuantity({ baseUrl: secureBaseUrl }, (err, qty) => {
+            utils.api.cart.getCartQuantity({ baseUrl: secureBaseUrl, cartId }, (err, qty) => {
                 if (err) {
                     reject(err);
                 }