Has been reported[1,2] several times on translatewiki.net in the past few days. User settings are most like to influence behaviour, but exact steps to reproduce are unknown.

[1] https://translatewiki.net/wiki/Thread:Support/Recent_changes_page_gives_an_Internal_Error
[2] https://translatewiki.net/wiki/Thread:Support/Internal_error:_LinkCache_doesn%27t_know_redirect_status

Details of error:

LinkCache doesn't know redirect status of this title: MediaWiki:Wikibase-statementview-referencesheading/ml

URL: http://translatewiki.net/w/i.php?title=Special:RecentChanges&translations=only&trailer=/ml (cannot be reproduced by me)

Backtrace:

#0 /www/translatewiki.net/w/includes/Linker.php(139): Title->isRedirect()
#1 /www/translatewiki.net/w/includes/Linker.php(341): Linker::getLinkColour(Object(Title), 0)
#2 /www/translatewiki.net/w/includes/Linker.php(248): Linker::linkAttribs(Object(Title), Array, Array)
#3 /www/translatewiki.net/w/extensions/CleanChanges/CleanChanges_body.php(218): Linker::link(Object(Title), '???????????????...', Array, Array)
#4 /www/translatewiki.net/w/extensions/CleanChanges/CleanChanges_body.php(145): NCL->makeLinks(Object(RCCacheEntry))
#5 /www/translatewiki.net/w/includes/specials/SpecialRecentchanges.php(536): NCL->recentChangesLine(Object(RecentChange), false, 195)
#6 /www/translatewiki.net/w/includes/specials/SpecialRecentchanges.php(178): SpecialRecentChanges->webOutput(Object(ResultWrapper), Object(FormOptions))
#7 /www/translatewiki.net/w/includes/SpecialPage.php(613): SpecialRecentChanges->execute(NULL)
#8 /www/translatewiki.net/w/includes/SpecialPageFactory.php(499): SpecialPage->run(NULL)
#9 /www/translatewiki.net/w/includes/Wiki.php(291): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#10 /www/translatewiki.net/w/includes/Wiki.php(565): MediaWiki->performRequest()
#11 /www/translatewiki.net/w/includes/Wiki.php(458): MediaWiki->main()
#12 /www/translatewiki.net/w/index.php(59): MediaWiki->run()
#13 {main}

URL: https://translatewiki.net/w/i.php?title=Special:RecentChanges&trailer=/qqq&translations=only&limit=5000

Reported error: LinkCache doesn't know redirect status of this title: MediaWiki:Articlefeedbackv5-percent-found/qqq

Reporting this agains CleanChanges, but it might as well be a core issue.

Version: 1.21.x
Severity: major
URL: http://translatewiki.net/w/i.php?title=Special:RecentChanges&limit=5000&days=300&hidebots=0&translations=only&trailer=%2Fml
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=37209