Bug on 3.9.7

Hi, since last update (3.9.7) I cannot create a new phone order : admin-ajax.php 403 error.
if I select a customer, I cannot select a product. If I select a product I cannot select the customer.

File js/build-app.js.
Thanks for help.

Renaud.

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