10 hours ago, mkdgs said:I've the same problem and i have a (bad) fix here
https://github.com/PrestaShop/PrestaShop/issues/27603#issuecomment-1054674505
I think is related to a data stored in the database (translation ?) after an upgrade.
At first I thought it was an update problem, then I analyzed some corrections made on some modules I use, in the end they added them all
{strip} tpl code... {/ strip} at the beginning and end of the back office .tpl files (of their modules) and the problems, at least for me, have all been solved.
Try applying this fix to the module generating the error, in the back office tpl file