Uncaught TypeError: e.fetchAvailability is not a function

I’m working with the Dawn theme - and every time I try to change variants on the product page which is defined by the funtion onVariantChange(), I get an error related to updatePickupAvailability(). I have no idea what it means - but the error is messing with the variant change and no one can add to cart after they’ve changed variants.

www.hypeunionstore.com

edit: temporary fix by removing updatePickupAvailability from the onVariantChange function. would be nice to know what went wrong though.