Guest Check Out hangs after entering the address

[prestamax]

After the update from PS 1.785 to PS 8.2 everything works fine except that the checkout process stops after entering the address at the guest checkout. After clicking on the Next button, the next step does not appear. Debug mode brings no insight. What could be the cause of this error?
For registered customers everything works fine.

[El Patron]

This is a common issue after upgrading PrestaShop, especially when guest checkout fails but registered customers can proceed. Here’s a step-by-step approach to help you troubleshoot:

Note:
Recent versions of PrestaShop have made a mess of the Terms of Service, newsletter signup, and similar options. Sometimes, the checkout expects you to check a Terms of Service (TOS) box or newsletter consent—even if it’s not displayed or you’ve set it to "No." If the next step won’t appear, it could be waiting for a hidden checkbox or validation. Inspect the page or settings for anything related to TOS or newsletter consent, and test toggling these options in your back office under Shop Parameters > Order Settings and Shop Parameters > Customer Settings.

1. Use Chrome Inspect to Check for JavaScript Errors

• Right-click anywhere on your checkout page and select Inspect.
• Go to the Console tab.
• Attempt the guest checkout process and look for any errors (they’ll appear in red).

If you see any error messages, copy them here—they often point directly to the source of the problem.

2. Clear Your Browser Cache & Try Incognito
Sometimes, your browser cache from the previous version can cause unexpected issues after an upgrade. Open your site in an incognito/private window to rule this out.

3. Test Third-Party Modules and Overrides One by One
After a major upgrade, it’s common for custom or third-party modules, or theme overrides, to break the guest checkout process. Instead of disabling all non-native modules at once, do the following for more targeted troubleshooting:

a. Switch to the Default Theme (Classic):
In the back office, go to Appearance > Theme & Logo and set your theme to Classic. Check if the guest checkout works.

If it works, your custom theme is probably the cause.

b. Disable Third-Party Modules One at a Time:
Go to Modules > Module Manager.

• Identify any non-native (third-party) modules, especially those related to checkout, customer, or cart functionality.
• Disable one module at a time, and after each, clear the cache (Advanced Parameters > Performance > Clear cache) and test guest checkout again.

This way, if disabling a specific module solves the problem, you’ve found the culprit.

c. Check for Overrides:

• Go to Advanced Parameters > Performance and scroll down to the "Optional Features" section.
• You can temporarily disable all overrides by switching "Disable all overrides" to YES.

If guest checkout starts working, it means an override is causing the issue.

To identify which one, you’ll need to manually review or disable overrides in the /override folder one by one.

4. Regenerate .htaccess & Clear PrestaShop Cache
In the back office, go to Advanced Parameters > Performance and clear the cache. Also, try regenerating your .htaccess by disabling and re-enabling friendly URLs.

5. Check Server Error Logs
Sometimes errors don’t appear in PrestaShop’s debug mode but are recorded in your web server error logs. If you have access, review recent entries.

[prestamax]

Thank you for the detailed description. It is somewhat reassuring to hear that others have the same problem. We've already tried a few steps. The problem also occurs with the Classic theme. Disabling the overrides didn't help either. The problem is probably with a third-party module. I'm afraid that will be a tedious search ...

[El Patron]

I made mistake, 1.7 modules/themes  do not work in ps8.   you should fallback (restore) to 1.7.8....this should have my first feedback, I was not thinkin clearly.

If you disable guest checkout the cart is ok?  if so take that as a win.

Edited June 28 by El Patron (see edit history)