We finally understand how to reproduce this issue.
That happening only when you access to your shop with the an url which is different of your shop domain configured in your BackOffice, eg : you configure www.domain.com in your backoffice and you try to access to domain.com in your front-office.
The fix of this issue is available here : https://github.com/PrestaShop/PrestaShop/commit/93038e45f80c0fbe31cfd61432c2826fe701c916
You need to delete the three lines below in your file classes/shop/Shop.php
// Optimization - don't redirect and allow WS and other script to work
if (!$id_shop)
$id_shop = Configuration::get('PS_SHOP_DEFAULT');
(and of course clear your browser cookies a last time :)"
- Måske andre kan bruge det?
- Thomas L.