Botched upgrade from 1.31 reverted back to 1.30 with a backup which probably wasn't very comprehensive, since the original backup failed and the backup-backup couldn't even be obtained.
https://wikizilla.org/wiki/Special:RecentChanges
The notice:
Notice: Undefined variable: type in /[...]/wiki/extensions/HeadScript/HeadScript.php on line 3
I have already fixed the issue that this talks about. More than that, I even commented out the extension on LocalSettings.php, turning off error notifications on the .htaccess on the folder containing /wiki/ & the .htaccess on /wiki/ . I've set $wgShowExceptionDetails to false. There is no error_reporting( -1); in there either. php.ini also has error reporting off. Yet this still shows. A dozen other extensions are broken too and recent changes.