Deprecated: Use of $wgUser was deprecated in MediaWiki 1.35. [Called from MediaWiki\HookContainer\HookContainer::callLegacyHook in /vagrant/mediawiki/includes/HookContainer/HookContainer.php at line 338] in /vagrant/mediawiki/includes/debug/MWDebug.php on line 377 #100
Likely to fatal in 1.37. Seems to be an issue inside the onOutputPageBodyAttributes hook.