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Backtrace:

#0 /var/www/mediawiki/core/includes/libs/rdbms/loadbalancer/LoadBalancer.php(769): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /var/www/mediawiki/core/includes/GlobalFunctions.php(2694): Wikimedia\Rdbms\LoadBalancer->getConnection(0, Array, 'uncm_meta')
#2 /var/www/mediawiki/core/extensions/Interwiki/includes/InterwikiHooks.php(44): wfGetDB(-1, Array, 'uncm_meta')
#3 /var/www/mediawiki/core/includes/Hooks.php(174): InterwikiHooks::onInterwikiLoadPrefix('an_inquiry_into...', Array)
#4 /var/www/mediawiki/core/includes/Hooks.php(202): Hooks::callHook('InterwikiLoadPr...', Array, Array, NULL)
#5 /var/www/mediawiki/core/includes/interwiki/ClassicInterwikiLookup.php(271): Hooks::run('InterwikiLoadPr...', Array)
#6 /var/www/mediawiki/core/includes/interwiki/ClassicInterwikiLookup.php(155): MediaWiki\Interwiki\ClassicInterwikiLookup->load('an_inquiry_into...')
#7 /var/www/mediawiki/core/includes/interwiki/ClassicInterwikiLookup.php(131): MediaWiki\Interwiki\ClassicInterwikiLookup->fetch('an_inquiry_into...')
#8 /var/www/mediawiki/core/includes/title/MediaWikiTitleCodec.php(321): MediaWiki\Interwiki\ClassicInterwikiLookup->isValidInterwiki('An_inquiry_into...')
#9 /var/www/mediawiki/core/includes/Title.php(3752): MediaWikiTitleCodec->splitTitleString('An_inquiry_into...', 0)
#10 /var/www/mediawiki/core/includes/Title.php(342): Title->secureAndSplit()
#11 /var/www/mediawiki/core/includes/Title.php(290): Title::newFromTextThrow('An inquiry into...', 0)
#12 /var/www/mediawiki/core/includes/parser/Parser.php(2289): Title::newFromText('An inquiry into...')
#13 /var/www/mediawiki/core/includes/parser/Parser.php(2143): Parser->replaceInternalLinks2('<div style="bor...')
#14 /var/www/mediawiki/core/includes/parser/Parser.php(1375): Parser->replaceInternalLinks('<div style="bor...')
#15 /var/www/mediawiki/core/includes/parser/Parser.php(476): Parser->internalParse('<div style="bor...')
#16 /var/www/mediawiki/core/includes/StubObject.php(112): Parser->parse('{{whoops|An inq...', Object(Title), Object(ParserOptions), true, true, 5933668)
#17 /var/www/mediawiki/core/includes/StubObject.php(138): StubObject->_call('parse', Array)
#18 /var/www/mediawiki/core/includes/content/WikitextContent.php(341): StubObject->__call('parse', Array)
#19 /var/www/mediawiki/core/includes/content/AbstractContent.php(517): WikitextContent->fillParserOutput(Object(Title), 5933668, Object(ParserOptions), true, Object(ParserOutput))
#20 /var/www/mediawiki/core/includes/Revision/RenderedRevision.php(242): AbstractContent->getParserOutput(Object(Title), 5933668, Object(ParserOptions), true)
#21 /var/www/mediawiki/core/includes/Revision/RenderedRevision.php(211): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached(Object(WikitextContent), true)
#22 /var/www/mediawiki/core/includes/Revision/RevisionRenderer.php(175): MediaWiki\Revision\RenderedRevision->getSlotParserOutput('main')
#23 /var/www/mediawiki/core/includes/Revision/RevisionRenderer.php(128): MediaWiki\Revision\RevisionRenderer->combineSlotOutput(Object(MediaWiki\Revision\RenderedRevision), Array)
#24 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}(Object(MediaWiki\Revision\RenderedRevision), Array)
#25 /var/www/mediawiki/core/includes/Revision/RenderedRevision.php(175): call_user_func(Object(Closure), Object(MediaWiki\Revision\RenderedRevision), Array)
#26 /var/www/mediawiki/core/includes/poolcounter/PoolWorkArticleView.php(194): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#27 /var/www/mediawiki/core/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#28 /var/www/mediawiki/core/includes/page/Article.php(774): PoolCounterWork->execute()
#29 /var/www/mediawiki/core/includes/actions/ViewAction.php(68): Article->view()
#30 /var/www/mediawiki/core/includes/MediaWiki.php(501): ViewAction->show()
#31 /var/www/mediawiki/core/includes/MediaWiki.php(294): MediaWiki->performAction(Object(Article), Object(Title))
#32 /var/www/mediawiki/core/includes/MediaWiki.php(860): MediaWiki->performRequest()
#33 /var/www/mediawiki/core/includes/MediaWiki.php(517): MediaWiki->main()
#34 /var/www/mediawiki/core/index.php(42): MediaWiki->run()
#35 {main}