Hi, I just updated a Contao to 4.13.6 on PHP 8.0.16 and an extension which I use also uses the contao-widget_tree_picker. I got some errors in the backend and tried to fix them: Warning: Trying to ...

finwe linked a pull request that will close this issue Fix "Undefined array key _ in Otl.php:1542" #1962 on Nov 30, 2023 ...