MediaWiki version: 1.35.0-wmf.15
Cannot roll back missing named ref "".
At this time there's 40 of these in logstash. I don't know how serious this is, but I doubt it's a reason to roll back the train.
https://logstash.wikimedia.org/goto/ee47deaf642f31bfa34e5a59a4212fdd for a direct logstash link, for those with access.
#0 /srv/mediawiki/php-1.35.0-wmf.15/extensions/Cite/src/ReferenceStack.php(266): Cite\ReferenceStack->rollbackRef(string, integer, string, string, NULL, string, array)
#1 /srv/mediawiki/php-1.35.0-wmf.15/extensions/Cite/src/Cite.php(447): Cite\ReferenceStack->rollbackRefs(integer)
#2 /srv/mediawiki/php-1.35.0-wmf.15/extensions/Cite/src/Cite.php(413): Cite\Cite->guardedReferences(Parser, string, array)
#3 /srv/mediawiki/php-1.35.0-wmf.15/extensions/Cite/src/Hooks/CiteParserTagHooks.php(73): Cite\Cite->references(Parser, string, array)
#4 /srv/mediawiki/php-1.35.0-wmf.15/includes/parser/Parser.php(4046): Cite\Hooks\CiteParserTagHooks::references(string, array, Parser, PPTemplateFrame_Hash)
#5 /srv/mediawiki/php-1.35.0-wmf.15/includes/parser/CoreParserFunctions.php(1111): Parser->extensionSubstitution(array, PPTemplateFrame_Hash)
#6 /srv/mediawiki/php-1.35.0-wmf.15/includes/parser/Parser.php(3569): CoreParserFunctions::tagObj(Parser, PPTemplateFrame_Hash, array)
#7 /srv/mediawiki/php-1.35.0-wmf.15/includes/parser/Parser.php(3273): Parser->callParserFunction(PPTemplateFrame_Hash, string, array)
#8 /srv/mediawiki/php-1.35.0-wmf.15/includes/parser/PPFrame_Hash.php(253): Parser->braceSubstitution(array, PPTemplateFrame_Hash)
#9 /srv/mediawiki/php-1.35.0-wmf.15/includes/parser/Parser.php(3451): PPFrame_Hash->expand(PPNode_Hash_Tree)
#10 /srv/mediawiki/php-1.35.0-wmf.15/includes/parser/PPFrame_Hash.php(253): Parser->braceSubstitution(array, PPFrame_Hash)
#11 /srv/mediawiki/php-1.35.0-wmf.15/includes/parser/Parser.php(3115): PPFrame_Hash->expand(PPNode_Hash_Tree, integer)
#12 /srv/mediawiki/php-1.35.0-wmf.15/includes/parser/Parser.php(1478): Parser->replaceVariables(string)
#13 /srv/mediawiki/php-1.35.0-wmf.15/includes/parser/Parser.php(586): Parser->internalParse(string)
#14 /srv/mediawiki/php-1.35.0-wmf.15/includes/content/WikitextContent.php(368): Parser->parse(string, Title, ParserOptions, boolean, boolean, NULL)
#15 /srv/mediawiki/php-1.35.0-wmf.15/includes/content/AbstractContent.php(555): WikitextContent->fillParserOutput(Title, NULL, ParserOptions, boolean, ParserOutput)
#16 /srv/mediawiki/php-1.35.0-wmf.15/includes/Revision/RenderedRevision.php(267): AbstractContent->getParserOutput(Title, NULL, ParserOptions, boolean)
#17 /srv/mediawiki/php-1.35.0-wmf.15/includes/Revision/RenderedRevision.php(236): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached(WikitextContent, boolean)
#18 /srv/mediawiki/php-1.35.0-wmf.15/includes/Revision/RevisionRenderer.php(215): MediaWiki\Revision\RenderedRevision->getSlotParserOutput(string)
#19 /srv/mediawiki/php-1.35.0-wmf.15/includes/Revision/RevisionRenderer.php(152): MediaWiki\Revision\RevisionRenderer->combineSlotOutput(MediaWiki\Revision\RenderedRevision, array)
#20 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}(MediaWiki\Revision\RenderedRevision, array)
#21 /srv/mediawiki/php-1.35.0-wmf.15/includes/Revision/RenderedRevision.php(198): call_user_func(Closure, MediaWiki\Revision\RenderedRevision, array)
#22 /srv/mediawiki/php-1.35.0-wmf.15/includes/Storage/DerivedPageDataUpdater.php(1290): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#23 [internal function]: MediaWiki\Storage\DerivedPageDataUpdater->getCanonicalParserOutput()
#24 /srv/mediawiki/php-1.35.0-wmf.15/includes/edit/PreparedEdit.php(104): call_user_func(array)
#25 /srv/mediawiki/php-1.35.0-wmf.15/includes/edit/PreparedEdit.php(119): MediaWiki\Edit\PreparedEdit->getOutput()
#26 /srv/mediawiki/php-1.35.0-wmf.15/includes/Storage/DerivedPageDataUpdater.php(1268): MediaWiki\Edit\PreparedEdit->__get(string)
#27 /srv/mediawiki/php-1.35.0-wmf.15/includes/page/WikiPage.php(2029): MediaWiki\Storage\DerivedPageDataUpdater->getPreparedEdit()
#28 /srv/mediawiki/php-1.35.0-wmf.15/includes/Storage/PageEditStash.php(130): WikiPage->prepareContentForEdit(WikitextContent, NULL, User, string, boolean)
#29 /srv/mediawiki/php-1.35.0-wmf.15/includes/api/ApiStashEdit.php(137): MediaWiki\Storage\PageEditStash->parseAndCache(WikiPage, WikitextContent, User, string)
#30 /srv/mediawiki/php-1.35.0-wmf.15/includes/api/ApiMain.php(1603): ApiStashEdit->execute()
#31 /srv/mediawiki/php-1.35.0-wmf.15/includes/api/ApiMain.php(539): ApiMain->executeAction()
#32 /srv/mediawiki/php-1.35.0-wmf.15/includes/api/ApiMain.php(510): ApiMain->executeActionWithErrorHandling()
#33 /srv/mediawiki/php-1.35.0-wmf.15/api.php(78): ApiMain->execute()
#34 /srv/mediawiki/w/api.php(3): require(string)
#35 {main}