==== Error ====
* mwversion: `1.37.0-wmf.6`
* reqId: `99a28e01-9e47-47dd-8973-cdf0abedd3e5`
* [[ https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:'2021-05-18T17:28:00.000Z',to:'2021-05-19T15:30:50.283Z'))&_a=(query:(query_string:(query:'reqId:%2299a28e01-9e47-47dd-8973-cdf0abedd3e5%22'))) | Find reqId in Logstash ]]
* [[ https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:now-30d,to:now))&_a=(query:(query_string:(query:'normalized_message:%22%5B%7BreqId%7D%5D%20%7Bexception_url%7D%20%20%20Wikimedia%5CAssert%5CPreconditionException:%20Precondition%20failed:%20This%20Title%20instance%20does%20not%20represent%20a%20proper%20page,%20but%20merely%20a%20link%20target.%22'))) | Find normalized_message in Logstash ]]
```name=normalized_message
[{reqId}] {exception_url} Wikimedia\Assert\PreconditionException: Precondition failed: This Title instance does not represent a proper page, but merely a link target.
```
```name=exception.trace,lines=10
from /srv/mediawiki/php-1.37.0-wmf.6/vendor/wikimedia/assert/src/Assert.php(49)
#0 /srv/mediawiki/php-1.37.0-wmf.6/includes/Title.php(4546): Wikimedia\Assert\Assert::precondition(boolean, string)
#1 /srv/mediawiki/php-1.37.0-wmf.6/includes/Title.php(4527): Title->assertProperPage()
#2 /srv/mediawiki/php-1.37.0-wmf.6/includes/PageProps.php(236): Title->getId()
#3 /srv/mediawiki/php-1.37.0-wmf.6/includes/PageProps.php(105): PageProps->getGoodIDs(array)
#4 /srv/mediawiki/php-1.37.0-wmf.6/extensions/Wikibase/client/includes/Store/Sql/PagePropsEntityIdLookup.php(46): PageProps->getProperties(array, array)
#5 /srv/mediawiki/php-1.37.0-wmf.6/extensions/Wikibase/client/includes/Store/Sql/PagePropsEntityIdLookup.php(57): Wikibase\Client\Store\Sql\PagePropsEntityIdLookup->getEntityIds(array)
#6 /srv/mediawiki/php-1.37.0-wmf.6/extensions/Wikibase/data-access/src/ByTypeDispatchingEntityIdLookup.php(62): Wikibase\Client\Store\Sql\PagePropsEntityIdLookup->getEntityIdForTitle(Title)
#7 /srv/mediawiki/php-1.37.0-wmf.6/extensions/Wikibase/client/includes/DataAccess/Scribunto/WikibaseLanguageIndependentLuaBindings.php(143): Wikibase\DataAccess\ByTypeDispatchingEntityIdLookup->getEntityIdForTitle(Title)
#8 /srv/mediawiki/php-1.37.0-wmf.6/extensions/Wikibase/client/includes/DataAccess/Scribunto/Scribunto_LuaWikibaseLibrary.php(566): Wikibase\Client\DataAccess\Scribunto\WikibaseLanguageIndependentLuaBindings->getEntityId(string, string)
#9 /srv/mediawiki/php-1.37.0-wmf.6/extensions/Scribunto/includes/engines/LuaSandbox/LuaSandboxCallback.php(26): Wikibase\Client\DataAccess\Scribunto\Scribunto_LuaWikibaseLibrary->getEntityId(string)
#10 [internal function]: Scribunto_LuaSandboxCallback->__call(string, array)
#11 /srv/mediawiki/php-1.37.0-wmf.6/extensions/Scribunto/includes/engines/LuaSandbox/LuaSandboxInterpreter.php(113): LuaSandboxFunction->call(LuaSandboxFunction)
#12 /srv/mediawiki/php-1.37.0-wmf.6/extensions/Scribunto/includes/engines/LuaCommon/LuaEngine.php(296): Scribunto_LuaSandboxInterpreter->callFunction(LuaSandboxFunction, LuaSandboxFunction)
#13 /srv/mediawiki/php-1.37.0-wmf.6/extensions/Scribunto/includes/engines/LuaCommon/LuaModule.php(68): Scribunto_LuaEngine->executeFunctionChunk(LuaSandboxFunction, PPTemplateFrame_Hash)
#14 /srv/mediawiki/php-1.37.0-wmf.6/extensions/Scribunto/includes/common/Hooks.php(128): Scribunto_LuaModule->invoke(string, PPTemplateFrame_Hash)
#15 /srv/mediawiki/php-1.37.0-wmf.6/includes/parser/Parser.php(3382): ScribuntoHooks::invokeHook(Parser, PPTemplateFrame_Hash, array)
#16 /srv/mediawiki/php-1.37.0-wmf.6/includes/parser/Parser.php(3067): Parser->callParserFunction(PPTemplateFrame_Hash, string, array)
#17 /srv/mediawiki/php-1.37.0-wmf.6/includes/parser/PPFrame_Hash.php(263): Parser->braceSubstitution(array, PPTemplateFrame_Hash)
#18 /srv/mediawiki/php-1.37.0-wmf.6/includes/parser/Parser.php(3256): PPFrame_Hash->expand(PPNode_Hash_Tree)
#19 /srv/mediawiki/php-1.37.0-wmf.6/includes/parser/PPFrame_Hash.php(263): Parser->braceSubstitution(array, PPFrame_Hash)
#20 /srv/mediawiki/php-1.37.0-wmf.6/includes/parser/Parser.php(2905): PPFrame_Hash->expand(PPNode_Hash_Tree, integer)
#21 /srv/mediawiki/php-1.37.0-wmf.6/includes/parser/Parser.php(1575): Parser->replaceVariables(string)
#22 /srv/mediawiki/php-1.37.0-wmf.6/includes/parser/Parser.php(648): Parser->internalParse(string)
#23 /srv/mediawiki/php-1.37.0-wmf.6/includes/cache/MessageCache.php(1321): Parser->parse(string, Title, ParserOptions, boolean)
#24 /srv/mediawiki/php-1.37.0-wmf.6/includes/specials/SpecialRecentChanges.php(654): MessageCache->parse(string, Title, boolean, boolean, Language)
#25 /srv/mediawiki/php-1.37.0-wmf.6/includes/specials/SpecialRecentChanges.php(536): SpecialRecentChanges->setTopText(FormOptions)
#26 /srv/mediawiki/php-1.37.0-wmf.6/includes/specialpage/ChangesListSpecialPage.php(1662): SpecialRecentChanges->doHeader(FormOptions, integer)
#27 /srv/mediawiki/php-1.37.0-wmf.6/includes/specialpage/ChangesListSpecialPage.php(1673): ChangesListSpecialPage->webOutputHeader(integer, FormOptions)
#28 /srv/mediawiki/php-1.37.0-wmf.6/includes/specialpage/ChangesListSpecialPage.php(674): ChangesListSpecialPage->webOutput(Wikimedia\Rdbms\ResultWrapper, FormOptions)
#29 /srv/mediawiki/php-1.37.0-wmf.6/includes/specials/SpecialRecentChanges.php(203): ChangesListSpecialPage->execute(NULL)
#30 /srv/mediawiki/php-1.37.0-wmf.6/includes/specialpage/SpecialPage.php(646): SpecialRecentChanges->execute(NULL)
#31 /srv/mediawiki/php-1.37.0-wmf.6/includes/specialpage/SpecialPageFactory.php(1390): SpecialPage->run(NULL)
#32 /srv/mediawiki/php-1.37.0-wmf.6/includes/MediaWiki.php(314): MediaWiki\SpecialPage\SpecialPageFactory->executePath(string, RequestContext)
#33 /srv/mediawiki/php-1.37.0-wmf.6/includes/MediaWiki.php(917): MediaWiki->performRequest()
#34 /srv/mediawiki/php-1.37.0-wmf.6/includes/MediaWiki.php(551): MediaWiki->main()
#35 /srv/mediawiki/php-1.37.0-wmf.6/index.php(53): MediaWiki->run()
#36 /srv/mediawiki/php-1.37.0-wmf.6/index.php(46): wfIndexMain()
#37 /srv/mediawiki/w/index.php(3): require(string)
#38 {main}
```
==== Impact ====
==== Notes ====