Redirection anonymous (pathauto ?)

Hi,

I'm using ubercart and pathauto (not sure is related to pathauto) with the following configuration :

Pathauto :
/user path is changed with pathauto.

Ubercart
Checkout disabled for anonymous user.

How to trigger bug :

Add a product in your cart as an anonymous user, try to go to checkout and get error : "This page isn’t working, website redirected you too many times.".

Fix :

In uc_cart/src/Controller/CheckoutController.php :

  // Send anonymous users to login page when anonymous checkout is disabled.
    if ($this->currentUser()->isAnonymous() && !$cart_config->get('checkout_anonymous')) {
      drupal_set_message($this->t('You must login before you can proceed to checkout.'));
      if ($this->config('user.settings')->get('register') != USER_REGISTER_ADMINISTRATORS_ONLY) {
        drupal_set_message($this->t('If you do not have an account yet, you should <a href=":url">register now</a>.', [':url' => Url::fromRoute('user.register', [], ['query' => drupal_get_destination()])->toString()]));
      }
// Change user.page to user.login
      return $this->redirect('user.login', [], ['query' => drupal_get_destination()]);
    }