[SOLVED] Combined discounts don't work

[Adrian P. Vales]

Hello

Since last week, on a site I maintain, the combined discount rules stopped working.

As you can see in the attached screenshots, we have many discount coupons, but when editing them, combinations between them are not possible because the list of other discounts doesn't load.

I don't see any error messages in the PrestaShop log, nothing relevant in the Apache log, I don't see any errors with the browser's developer tools, and the PrestaShop debug doesn't tell me anything.

I'm completing lost with this error.

Edited July 16 by Adrian P. Vales
Solved (see edit history)

[Prestashop Addict]

Please can you specify PS, PHP versions

[Adrian P. Vales]

Hello

That's part of the problem. The client didn't let me update the site for years, so it's still Prestashop 1.7.7.5 running on a PHP 7.4 server. I tried locally to upgrade to the last version under a PHP 8, but this don't solve the issue.

[ComGrafPL]

No changes has been made? No module updates etc?

[Adrian P. Vales]

Hello

I updated the modules on Tuesday, but the problem didn't appear until Sunday. The client assured me nothing had changed.

Edit:
I hate this client so much.

After two weeks of fighting this error, restoring the DDBB and files to the local backup to try to identify the error, I finally decided to restore a backup from before updating the modules. Hallelujah! Solved!

And the client tells me they don't care... that I should just leave it as it is, that the palliative module I installed in the meantime should work for them...