[PS 9.0.2] Error 500 when accessing Customer Groups page: "groupId" parameter missing for route "admin_customer_groups_edit"

[christiandouchamps]

Prerequisites

• I understand and accept the project's code of conduct.
• I have already searched in existing issues and found no previous report of this bug.

Describe the bug and add attachments

Bug description

When trying to access the Customer Groups page in the back office (Shop Parameters > Customer Settings > Groups), I get an HTTP 500 error with the following exception:

Expected behavior

The Customer Groups page should load normally and display the list of groups with edit/delete options.

Steps to reproduce

Some mandatory parameters are missing ("groupId") to generate a URL for route "admin_customer_groups_edit".
Exception: Symfony\Component\Routing\Exception\MissingMandatoryParametersException
in vendor/symfony/routing/Generator/UrlGenerator.php (line 166)

The Groups page is completely inaccessible. The groups exist in the database (verified via SQL query on ps_group table) but cannot be viewed or edited through the back office.

Workaround

Currently, the only way to manage customer groups is directly via SQL queries in phpMyAdmin, which is not user-friendly for merchants.

1. Install PrestaShop 9.0.1
2. Upgrade to PrestaShop 9.0.2 using the 1-Click Upgrade module
3. Go to Back Office > Shop Parameters > Customer Settings > Groups
4. Error 500 appears with the MissingMandatoryParametersException

PrestaShop version(s) where the bug happened

9.0.2 (upgraded from 9.0.1)

How you installed PrestaShop

1-Click Upgrade module

PHP version(s) where the bug happened

8.3.28

If your bug is related to a module, specify its name and its version

No response

Your company or customer's name goes here (if applicable).

Not related to a module - core routing bug for admin_customer_groups_edit route

[Quetzacoalt91]

Hi there,

I've update a fresh PrestaShop 9.0.1 to 9.0.2 and attempted to open the Groups page

As well as the creation page

And the edition

So far so good. Did something tempered the permissions of your store? Or is the issue on a step I've missed?

[AureRita]

Hi @christiandouchamps

Thank you for your report, Currently I tried to reproduce your issue but I can't as you can see :

Capture.video.du.2026-01-20.16-59-24.mp4

Can you provide your version of Autoupgrade ? Because we have modification on customer settings on new version Update assistant v7.5.0 as you'll see on this PR : #1521

Can you tell us if you can reproduce your issue with update assistant v7.5.0 ?

Waiting for feedbacks

[Hlavtox]

@christiandouchamps Did you try deleting cache manually?