Non-numeric value encountered in batch_manager.php on line 790

[silaxe]

Dear all,
My piwigo batch manager has gone bananas lately. Especially, I'm seeing the following message at the top of the page : "Warning: A non-numeric value encountered in /var/www/photos/admin/batch_manager.php on line 790".
I don't know if this is a consequence of the message above but the batch manager is not usable at all now (for example I can't select filters or photos anymore).
Any idea what is causing the problem?
After I got this issue I tried to make a fresh install of piwigo (kept the mysql database and moved my saved upload folder back into the fresh install folder): the issue is still there, which makes me wonder whether the issue could be linked to the content of the mysql database or the upload folder?
Thanks in advance for your help!

[silaxe]

I was able to solve my issue by downgrading PHP from version 8.1.26 to version 8.0.30.