Short:
Bug reported: ( ! ) Fatal error: Call to a member function getTitle() on null in /var/www/html/includes/changes/EnhancedChangesList.php on line 499
URL: https://urlivewiki.com/wiki/Special:RecentChanges (archive: https://archive.is/2Ybgm)
Reproducible by: Heading to above address
Normal behavior: Shows the last 250 edits on the wiki, sorted by date/page/edit amount
Server Details:
Ubuntu 14.04.2 LTS server with Apache2 as web server
MediaWiki 1.2.6 using Vector skin (formerly custom URLive skin)
PHP 5.6
MySQL 5.6

Long:
Greetings. I help monitor and moderate a tabletop wiki for URealms Live. As stated in the title, we currently have an issue with the Special:RecentChanges page, where it errors when calling getTitle() in the EnhancedChangesList.php (page in question: https://urlivewiki.com/wiki/Special:RecentChanges, with an archive of the error here, should it be resolved and needed for the future).

This occurred shortly after upgrading to 1.2.6 (from 1.2.5), which also broke the primary custom skin (non-issue). As far as I can tell, none of the scripts are modified, and restarting the services/server did not clear up the issue. Just in case, I have included the apache2 log from today, which also repeats what is stated on the web page. any other logs can be given upon request, with private data redacted.