Wikimedia Bugzilla is closed!

Fatal error: Call to a member function getParserOutput() on a non-object in {mediawiki/core}/includes/WikiPage.php on line 3348

Looks like the code tries to get a content object and then neither it nor ContentHandler considers the case where the page doesn't exist and doesn't have normal content.

Previously it worked fine and just outputted empty output.

Making all the fallback code and core code explicitly handle the case where there is no content is one possibility. Or we might add something like an EmptyContent class.