Getting javascript error with Smart Coupon

We have Smart Coupons added to the shop where a customer can add the amount they’d like to make the Gift Certificate for. But while the PRODUCT is getting passed through, the amount – say $50 – isn’t getting passed through to the card. So the cart has a gift certificate in the amount of $0 in it.

This had been working but with a recent WP Store update it isn’t anymore. I reached out to the Smart Coupon team and the found this js error:
https://launchboutique.com/wp-content/uploads/Screen-Shot-2020-08-21-at-12.32.33-1.png

Any help would be appreciated.

The page I need help with: [log in to see the link]