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.

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Start by reproducing the failure in the Enatega Multivendor Customer App: open the product catalog, select an item, and attempt to add it to the cart. Trace the add-to-cart flow and cart count from that interaction. Done means the selected item appears in the cart, the cart icon count updates, and the reported error no longer occurs.

Written by the indexing model from the issue text.