Customers encounter the error:

Uncaught (in promise) TypeError: Cannot read properties of null (reading 'balance')

This occurs while using the web checkout or when pressing the Continue button.

As a result, the web checkout gets stuck in an infinity loading state, preventing the order completion.

This error usually means that a payment gateway is missing from the web checkout settings.

If a gateway is already assigned but the error persists, make sure that all necessary details - such as currency and merchant account - are set up on the gateway.