redirect loop when deleting item in cart

Hello if I delete an item in my cart or update the quantity to "0" and hit refresh, my safari and chrome browsers throw a redirect loop error even after deleting cookies.

Reproduction:

Go to augustusdrugclass.com/alcohol-drug-awareness-class and click "add-to-cart"
Next update the quantity to "0" and hit the refresh icon.
You should experience a redirect loop error in the browser

This is delaying my project for a customer.

Hi, can you try to download the last version of Hikashop an install it again ?