Bug on Prestashop cart: can't get past the address section

Job ID: 31857129

Budget: €8 – €30 EUR

Only for some customers (without understanding why) during checkout, after entering the address and clicking continue, the page is updated but always remaining in that section, it is not possible to continue with the choice of the courier.
In this way the customer cannot complete the order.
Related categories: PHP eCommerce Prestashop MySQL HTML