Unable to Add Items to Cart in Enatega Multivendor Customer App

Description:
Users are encountering a critical issue in the Enatega Multivendor Customer App where they are unable to add items to their shopping cart.

Steps to Reproduce:
Open the Enatega Multivendor Customer App.
Browse the product catalog and select any item.
Attempt to add the selected item to the shopping cart.

Expected Behavior:
The selected item should be added to the shopping cart, and the cart icon should reflect the updated item count.

Observed Behaviour:
Upon attempting to add an item to the cart, users are encountering an error, and the selected item is not added to the cart. The cart count remains unchanged.

007ed24b-bd22-48e1-b880-1760e30ae688.mp4

Start by reproducing the failure in the Enatega Multivendor Customer App while following the listed catalog and add-to-cart steps, then trace the customer app's add-to-cart entry point and the resulting error. Done means the selected item is added successfully and the cart icon reflects the updated item count.

Written by the indexing model from the issue text.