Blank page modules after upgrading from PrestaShop 8.x to 9.0

[guill4um3]

Hi everyone,

I recently upgraded my PrestaShop store from 8.x to 9.0, and since then I’m getting a blank page only on the “Modules” page in the back office.

After the upgrade, I cleared all caches, restarted PHP-FPM, and rechecked file permissions.

When I open:

/admin3434/index.php/improve/modules/manage

I only get a blank white page (HTTP 200) — the rest of the back office (Dashboard, Stats, etc.) works fine.

Even with _PS_MODE_DEV_ enabled and overrides disabled, no error or exception appears, and both:

var/log/dev.log

var/log/prod.log

remain empty (no entries at all when loading the page).

In the Apache logs I only see:

"GET /admin3434/index.php/improve/modules/manage ... 200 361"

So it looks like the controller runs, but returns an empty output.

 

[ComGrafPL]

Have you tried disable modules, prestashop / custome ones. Like accounts, metrics etc. ?  Probably some module isnt updated to work on v9 either higher php.

[guill4um3]

Yes, all the modules are disabled.
I even tried deleting them before the update and then performing the update afterward.

[El Patron]

what is (and always post) your prestashop version.

Open Chrome DevTools → Console and Network on /improve/modules/manage.

If you see any failing XHR to .../ajax?... or addons.prestashop.com, note the error—it’s a big hint.

Switch your employee language to English (en-US) and reload the page. Locale/ICU mismatches can silently explode that view.

you mind find this blog post helpful

https://prestaheroes.com/blogs/prestashop-alerts/how-to-enable-prestashop-debug-mode-v8-v9