[Solved] Error with discount coupons

[oscarm2]

Hello.

I've been looking for some time now to see what could be wrong with my store, but I don't see the solution.

I use Prestashop 8.1.7 with PHP 8.1.31.

I have created several coupons, but they don't work. When I add a coupon that doesn't exist, the action works fine, giving an error message saying that the coupon doesn't exist (https://prnt.sc/mudh_8uMXK5g)

But when I use a coupon that does exist, an empty error appears and nothing applies (https://prnt.sc/V1XEPWRFGd41)

I used a paid template, but I changed it to the classic theme to see if that was the reason and it's still the same.

Any idea what it could be? I moved the site to a test subdomain to play around with things, in case you want to check how it works (https://test.bozoom.es). A valid coupon would be BZM5ENE

Thanks

Edited February 6 by oscarm2
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[Knowband Plugins]

Hi,

If valid coupons in PrestaShop 8.1.7 show a blank error and don’t apply, first enable debug mode (config/defines.inc.php) to check for errors.
Inspect the browser console (F12 → Console) for JavaScript issues.
Verify the coupon in the database (ps_cart_rule) to ensure it's active, has valid dates, and quantity > 0.
Disable any third-party modules related to checkout or cart rules from Modules → Module Manager.

Finally, test applying the coupon manually from Orders → Carts → Edit Cart. If the issue persists, check the debug log for further details.

Regards.

[oscarm2]

Oh, thanks for the reply.
I already found out that it was causing problems with a module. By disabling that module, the coupons started working correctly again.
I forgot to close this topic

[Divine]

Then you can just edit your first post and add [Solved] in the title