Version: 1.29 (REL1_29)
PHP: 5.6
When trying to upgrade to 1.29 getting fatal. It only happens when trying to access specialpages it seems.
2017-08-07 17:57:44 test1 test1wiki: [4a5a80bbaefe54de5a8616ff] /wiki/Special:Version MWException from line 126 of /srv/mediawiki/w/includes/page/WikiPage.php: Invalid or virtual namespace -1 given.
#0 /srv/mediawiki/w/extensions/AccessControl/AccessControl.hooks.php(86): WikiPage::factory(Title)
#1 /srv/mediawiki/w/extensions/AccessControl/AccessControl.hooks.php(295): AccessControlHooks::getContentPage(integer, string)
#2 [internal function]: AccessControlHooks::onUserCan(Title, User, string, string)
#3 /srv/mediawiki/w/includes/Hooks.php(186): call_user_func_array(string, array)
#4 /srv/mediawiki/w/includes/Title.php(2091): Hooks::run(string, array)
#5 /srv/mediawiki/w/includes/Title.php(2533): Title->checkPermissionHooks(string, User, array, string, boolean)
#6 /srv/mediawiki/w/includes/Title.php(1957): Title->getUserPermissionsErrorsInternal(string, User, string)
#7 /srv/mediawiki/w/includes/MediaWiki.php(206): Title->getUserPermissionsErrors(string, User)
#8 /srv/mediawiki/w/includes/MediaWiki.php(862): MediaWiki->performRequest()
#9 /srv/mediawiki/w/includes/MediaWiki.php(523): MediaWiki->main()
#10 /srv/mediawiki/w/index.php(43): MediaWiki->run()
#11 {main}