Hi, I just updated to MediaWiki 1.37 and get now the following error:
Use of User::getEffectiveGroups was deprecated in MediaWiki 1.35. [Called from MediaWiki\Extensions\Lockdown\Hooks::onGetUserPermissionsErrors in /var/www/html/extensions/Lockdown/src/Hooks.php at line 123] in /var/www/html/includes/debug/MWDebug.php on line 375
I think the code should be fixed here. I hope someone could help out.