TypeError: addrs.isDefaultBilling is not a function

[jerry-shopcommerce]

Preconditions

Magento Version : 2.2.9

Module Versions :

smile/module-map            1.1.6
smile/module-retailer       1.2.8
smile/module-seller         1.2.5
smile/module-store-delivery 1.1.4
smile/module-store-locator  1.3.9.3

Environment : Developer

Steps to reproduce

With a not logged in customer

1. Add a product to your cart
2. Go to the checkout
3. Enter your email
4. Select a store to deliver
5. Click next to go to your billing address

Expected result

1. Being able to enter your billing address

Actual result

1. Checkout loader does not disappear
2. In the js console there is an error: TypeError: addrs.isDefaultBilling is not a function (checkout-data-resolver.js:248:31)

In the file vendor/smile/module-store-delivery/view/frontend/web/js/model/store-address.js there does not seem to be a function called isDefaultBilling. When i add the function and let it return false, the error disappears from my console and i am able to proceed with entering my billing details.

Tested with a not logged in customer, checkout functions as expected, a order can be placed. I have not tested this with logged in customers.