I cannot undestand why one page of my site doesn't work any more.
I didn't modify that page but now it produce the following errors
0 - htmlspecialchars(): Argument #1 ($string) must be of type string, stdClass given
The URL of the page is
https://www.pm-online.it/mappa-corsi
The name of the page is
Corsi gestiti V3
Joomla and all the components are updated to the latest J3 versions available