TypeError: Wikimedia\Parsoid\Core\DOMCompat::getPreviousElementSibling(): Argument #1 ($node) must be of type DOMElement|DOMCharacterData|Wikimedia\Parsoid\DOM\Element|Wikimedia\Parsoid\DOM\CharacterData, null given
Closed, ResolvedPublicPRODUCTION ERROR
Actions

Description

Error

service.version: 1.46.0-wmf.14
timestamp: 2026-02-05T19:07:43.560Z
labels.phpversion: 8.3.30
trace.id: bf9e3770-1ad2-4f24-b48d-4a0096b62531
Find trace.id in Logstash

labels.normalized_message

[{reqId}] {exception_url}   TypeError: Wikimedia\Parsoid\Core\DOMCompat::getPreviousElementSibling(): Argument #1 ($node) must be of type DOMElement|DOMCharacterData|Wikimedia\Parsoid\DOM\Element|Wikimedia\Parsoid\DOM\CharacterData, null given, called in

Frame	Location	Call
from	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Core/DOMCompat.php(413)
#0	/srv/mediawiki/php-1.46.0-wmf.14/extensions/Cite/src/Parsoid/References.php(510)	Wikimedia\Parsoid\Core\DOMCompat::getPreviousElementSibling(null)
#1	/srv/mediawiki/php-1.46.0-wmf.14/extensions/Cite/src/Parsoid/References.php(704)	Cite\Parsoid\References->insertReferencesIntoDOM(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, Wikimedia\Parsoid\DOM\Element, Cite\Parsoid\ReferencesData, bool)
#2	/srv/mediawiki/php-1.46.0-wmf.14/extensions/Cite/src/Parsoid/References.php(715)	Cite\Parsoid\References->processRefs(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, Cite\Parsoid\ReferencesData, Wikimedia\Parsoid\DOM\DocumentFragment)
#3	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Utils/ContentUtils.php(169)	Cite\Parsoid\References->Cite\Parsoid\{closure}(Wikimedia\Parsoid\DOM\DocumentFragment)
#4	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Ext/ParsoidExtensionAPI.php(690)	Wikimedia\Parsoid\Utils\ContentUtils::processAttributeEmbeddedDom(MediaWiki\Parser\Parsoid\Config\SiteConfig, Wikimedia\Parsoid\DOM\Element, Closure)
#5	/srv/mediawiki/php-1.46.0-wmf.14/extensions/Cite/src/Parsoid/References.php(713)	Wikimedia\Parsoid\Ext\ParsoidExtensionAPI->processAttributeEmbeddedDom(Wikimedia\Parsoid\DOM\Element, Closure)
#6	/srv/mediawiki/php-1.46.0-wmf.14/extensions/Cite/src/Parsoid/References.php(721)	Cite\Parsoid\References->processRefs(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, Cite\Parsoid\ReferencesData, Wikimedia\Parsoid\DOM\Element)
#7	/srv/mediawiki/php-1.46.0-wmf.14/extensions/Cite/src/Parsoid/References.php(721)	Cite\Parsoid\References->processRefs(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, Cite\Parsoid\ReferencesData, Wikimedia\Parsoid\DOM\Element)
#8	/srv/mediawiki/php-1.46.0-wmf.14/extensions/Cite/src/Parsoid/References.php(721)	Cite\Parsoid\References->processRefs(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, Cite\Parsoid\ReferencesData, Wikimedia\Parsoid\DOM\Element)
#9	/srv/mediawiki/php-1.46.0-wmf.14/extensions/Cite/src/Parsoid/References.php(721)	Cite\Parsoid\References->processRefs(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, Cite\Parsoid\ReferencesData, Wikimedia\Parsoid\DOM\Element)
#10	/srv/mediawiki/php-1.46.0-wmf.14/extensions/Cite/src/Parsoid/CiteDocumentPostProcessor.php(31)	Cite\Parsoid\References->processRefs(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, Cite\Parsoid\ReferencesData, Wikimedia\Parsoid\DOM\Element)
#11	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Wt2Html/DOM/Processors/RunExtensionProcessors.php(109)	Cite\Parsoid\CiteDocumentPostProcessor->wtPostprocess(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, Wikimedia\Parsoid\DOM\Element, array)
#12	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Wt2Html/DOMProcessorPipeline.php(131)	Wikimedia\Parsoid\Wt2Html\DOM\Processors\RunExtensionProcessors->run(Wikimedia\Parsoid\Config\Env, Wikimedia\Parsoid\DOM\Element, array, bool)
#13	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Wt2Html/DOMProcessorPipeline.php(175)	Wikimedia\Parsoid\Wt2Html\DOMProcessorPipeline->doPostProcess(Wikimedia\Parsoid\DOM\Element)
#14	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Wt2Html/DOMProcessorPipeline.php(188)	Wikimedia\Parsoid\Wt2Html\DOMProcessorPipeline->process(Wikimedia\Parsoid\DOM\Element, array)
#15	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipeline.php(159)	Wikimedia\Parsoid\Wt2Html\DOMProcessorPipeline->processChunkily(Wikimedia\Parsoid\DOM\Element, array)
#16	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipeline.php(181)	Wikimedia\Parsoid\Wt2Html\ParserPipeline->processPipelineStages(array, string, array)
#17	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipelineFactory.php(617)	Wikimedia\Parsoid\Wt2Html\ParserPipeline->parseChunkily(string, array)
#18	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Wikitext/ContentModelHandler.php(181)	Wikimedia\Parsoid\Wt2Html\ParserPipelineFactory->parse(string)
#19	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Parsoid.php(204)	Wikimedia\Parsoid\Wikitext\ContentModelHandler->toDOM(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, null)
#20	/srv/mediawiki/php-1.46.0-wmf.14/vendor/wikimedia/parsoid/src/Parsoid.php(270)	Wikimedia\Parsoid\Parsoid->parseWikitext(MediaWiki\Parser\Parsoid\Config\PageConfig, MediaWiki\Parser\ParserOutput, array, null)
#21	/srv/mediawiki/php-1.46.0-wmf.14/includes/Parser/Parsoid/ParsoidParser.php(153)	Wikimedia\Parsoid\Parsoid->wikitext2html(MediaWiki\Parser\Parsoid\Config\PageConfig, array, null, MediaWiki\Parser\ParserOutput)
#22	/srv/mediawiki/php-1.46.0-wmf.14/includes/Parser/Parsoid/ParsoidParser.php(288)	MediaWiki\Parser\Parsoid\ParsoidParser->genParserOutput(MediaWiki\Parser\Parsoid\Config\PageConfig, MediaWiki\Parser\ParserOptions, null)
#23	/srv/mediawiki/php-1.46.0-wmf.14/includes/Content/WikitextContentHandler.php(375)	MediaWiki\Parser\Parsoid\ParsoidParser->parse(string, MediaWiki\Title\Title, MediaWiki\Parser\ParserOptions, bool, bool, int, null)
#24	/srv/mediawiki/php-1.46.0-wmf.14/includes/Content/ContentHandler.php(1574)	MediaWiki\Content\WikitextContentHandler->fillParserOutput(MediaWiki\Content\WikitextContent, MediaWiki\Content\Renderer\ContentParseParams, MediaWiki\Parser\ParserOutput)
#25	/srv/mediawiki/php-1.46.0-wmf.14/includes/Content/Renderer/ContentRenderer.php(67)	MediaWiki\Content\ContentHandler->getParserOutput(MediaWiki\Content\WikitextContent, MediaWiki\Content\Renderer\ContentParseParams)
#26	/srv/mediawiki/php-1.46.0-wmf.14/includes/Revision/RenderedRevision.php(246)	MediaWiki\Content\Renderer\ContentRenderer->getParserOutput(MediaWiki\Content\WikitextContent, MediaWiki\Page\PageIdentityValue, MediaWiki\Revision\RevisionStoreCacheRecord, MediaWiki\Parser\ParserOptions, array)
#27	/srv/mediawiki/php-1.46.0-wmf.14/includes/Revision/RenderedRevision.php(219)	MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached(MediaWiki\Content\WikitextContent, array)
#28	/srv/mediawiki/php-1.46.0-wmf.14/includes/Revision/RevisionRenderer.php(225)	MediaWiki\Revision\RenderedRevision->getSlotParserOutput(string, array)
#29	/srv/mediawiki/php-1.46.0-wmf.14/includes/Revision/RevisionRenderer.php(158)	MediaWiki\Revision\RevisionRenderer->combineSlotOutput(MediaWiki\Revision\RenderedRevision, MediaWiki\Parser\ParserOptions, array)
#30	/srv/mediawiki/php-1.46.0-wmf.14/includes/Revision/RenderedRevision.php(182)	MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}(MediaWiki\Revision\RenderedRevision, array)
#31	/srv/mediawiki/php-1.46.0-wmf.14/includes/Page/ParserOutputAccess.php(590)	MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#32	/srv/mediawiki/php-1.46.0-wmf.14/includes/Page/ParserOutputAccess.php(505)	MediaWiki\Page\ParserOutputAccess->renderRevision(MediaWiki\Page\WikiPage, MediaWiki\Parser\ParserOptions, MediaWiki\Revision\RevisionStoreCacheRecord, array, null)
#33	/srv/mediawiki/php-1.46.0-wmf.14/includes/Page/ParserOutputAccess.php(579)	MediaWiki\Page\ParserOutputAccess->getParserOutput(MediaWiki\Page\WikiPage, MediaWiki\Parser\ParserOptions, MediaWiki\Revision\RevisionStoreCacheRecord, array)
#34	/srv/mediawiki/php-1.46.0-wmf.14/includes/Page/ParserOutputAccess.php(681)	MediaWiki\Page\ParserOutputAccess->renderRevision(MediaWiki\Page\WikiPage, MediaWiki\Parser\ParserOptions, MediaWiki\Revision\RevisionStoreCacheRecord, array)
#35	/srv/mediawiki/php-1.46.0-wmf.14/includes/PoolCounter/PoolCounterWorkViaCallback.php(68)	MediaWiki\Page\ParserOutputAccess->MediaWiki\Page\{closure}()
#36	/srv/mediawiki/php-1.46.0-wmf.14/includes/PoolCounter/PoolCounterWork.php(159)	MediaWiki\PoolCounter\PoolCounterWorkViaCallback->doWork()
#37	/srv/mediawiki/php-1.46.0-wmf.14/includes/Page/ParserOutputAccess.php(495)	MediaWiki\PoolCounter\PoolCounterWork->execute()
#38	/srv/mediawiki/php-1.46.0-wmf.14/includes/Page/Article.php(883)	MediaWiki\Page\ParserOutputAccess->getParserOutput(MediaWiki\Page\WikiPage, MediaWiki\Parser\ParserOptions, MediaWiki\Revision\RevisionStoreCacheRecord, array)
#39	/srv/mediawiki/php-1.46.0-wmf.14/includes/Page/Article.php(544)	MediaWiki\Page\Article->generateContentOutput(MediaWiki\User\User, MediaWiki\Parser\ParserOptions, int, MediaWiki\Output\OutputPage, array)
#40	/srv/mediawiki/php-1.46.0-wmf.14/includes/Actions/ViewAction.php(71)	MediaWiki\Page\Article->view()
#41	/srv/mediawiki/php-1.46.0-wmf.14/includes/Actions/ActionEntryPoint.php(739)	MediaWiki\Actions\ViewAction->show()
#42	/srv/mediawiki/php-1.46.0-wmf.14/includes/Actions/ActionEntryPoint.php(510)	MediaWiki\Actions\ActionEntryPoint->performAction(MediaWiki\Page\Article, MediaWiki\Title\Title)
#43	/srv/mediawiki/php-1.46.0-wmf.14/includes/Actions/ActionEntryPoint.php(144)	MediaWiki\Actions\ActionEntryPoint->performRequest()
#44	/srv/mediawiki/php-1.46.0-wmf.14/includes/MediaWikiEntryPoint.php(180)	MediaWiki\Actions\ActionEntryPoint->execute()
#45	/srv/mediawiki/php-1.46.0-wmf.14/index.php(44)	MediaWiki\MediaWikiEntryPoint->run()
#46	/srv/mediawiki/w/index.php(3)	require(string)
#47	{main}

Impact

Notes

Seeing about 4000 of these in 1.46.0-wmf.14 (T413805). Happening at a pretty steady rate since ~17:40 UTC, the majority for skwiki.

Details

Request URL: https://sk.wikipedia.org/wiki/[page]

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	Parsoid: Add safeguard when checking for reflist template	mediawiki/extensions/Cite	master	+1 -1
	Parsoid: Add safeguard when checking for reflist template	mediawiki/extensions/Cite	wmf/1.46.0-wmf.15	+1 -1

Customize query in gerrit

Related Objects

Mentioned In: T411852: Wikimedia\Assert\ParameterTypeException: Bad value for parameter $node: must be a Wikimedia\Parsoid\DOM\Element|Wikimedia\Parsoid\DOM\CharacterData|DOMElement|DOMCharacterData
T415906: TypeError: Wikimedia\Parsoid\Utils\DOMCompat::getPreviousElementSibling(): Argument #1 ($node) must be of type DOMElement|DOMCharacterData|Wikimedia\Parsoid\DOM\Element|Wikimedia\Parsoid\DOM\CharacterData, null given
Mentioned Here: T415906: TypeError: Wikimedia\Parsoid\Utils\DOMCompat::getPreviousElementSibling(): Argument #1 ($node) must be of type DOMElement|DOMCharacterData|Wikimedia\Parsoid\DOM\Element|Wikimedia\Parsoid\DOM\CharacterData, null given
T413805: 1.46.0-wmf.14 deployment blockers

Event Timeline

brennen created this task.Feb 5 2026, 7:17 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptFeb 5 2026, 7:17 PM

Seems to have started quite a bit later than the train rolled to all group2, at 10:36 UTC:

https://sal.toolforge.org/log/MqZgLZwB8tZ8Ohr0Wave

Dup of T415906: TypeError: Wikimedia\Parsoid\Utils\DOMCompat::getPreviousElementSibling(): Argument #1 ($node) must be of type DOMElement|DOMCharacterData|Wikimedia\Parsoid\DOM\Element|Wikimedia\Parsoid\DOM\CharacterData, null given, probably.

Looks like pretty much every single log entry is for the same skwiki page ... so, we should fix it, but probably doesn't need a rollback.

brennen merged a task: T415906: TypeError: Wikimedia\Parsoid\Utils\DOMCompat::getPreviousElementSibling(): Argument #1 ($node) must be of type DOMElement|DOMCharacterData|Wikimedia\Parsoid\DOM\Element|Wikimedia\Parsoid\DOM\CharacterData, null given.Feb 5 2026, 7:53 PM

MSantos moved this task from Backlog to Tracking on the Content-Transform-Team board.Thu, Feb 12, 3:18 PM

This was introduced with https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cite/+/1170529 and I'm assigning it back to the WMDE team to determine if they want to revert that patch or improve it.

MSantos edited projects, added Cite; removed Parsoid.Thu, Feb 12, 3:26 PM

MSantos added a project: Parsoid.

MSantos removed a project: Parsoid.

WMDE-Fisch added projects: Unplanned-Sprint-Work, WMDE-TechWish-Sprint-2026-02-03-Tomatoes-of-many-colors.Thu, Feb 12, 3:54 PM

Change #1239151 had a related patch set uploaded (by WMDE-Fisch; author: WMDE-Fisch):

[mediawiki/extensions/Cite@master] Parsoid: Add safeguard when checking for reflist template

https://gerrit.wikimedia.org/r/1239151

gerritbot added a project: Patch-For-Review.Thu, Feb 12, 4:09 PM

WMDE-Fisch moved this task from Sprint Backlog to Tech Review on the WMDE-TechWish-Sprint-2026-02-03-Tomatoes-of-many-colors board.Thu, Feb 12, 4:14 PM

Change #1239151 merged by jenkins-bot:

[mediawiki/extensions/Cite@master] Parsoid: Add safeguard when checking for reflist template

https://gerrit.wikimedia.org/r/1239151

ReleaseTaggerBot added a project: MW-1.46-notes (1.46.0-wmf.16; 2026-02-17).Thu, Feb 12, 9:00 PM

Maintenance_bot removed a project: Patch-For-Review.Thu, Feb 12, 9:31 PM

WMDE-Fisch removed WMDE-Fisch as the assignee of this task.Fri, Feb 13, 7:48 AM

WMDE-Fisch moved this task from Tech Review to Done on the WMDE-TechWish-Sprint-2026-02-03-Tomatoes-of-many-colors board.

WMDE-Fisch subscribed.

Change #1239573 had a related patch set uploaded (by WMDE-Fisch; author: WMDE-Fisch):

[mediawiki/extensions/Cite@wmf/1.46.0-wmf.15] Parsoid: Add safeguard when checking for reflist template

https://gerrit.wikimedia.org/r/1239573

gerritbot added a project: Patch-For-Review.Mon, Feb 16, 7:53 AM

Change #1239573 merged by jenkins-bot:

[mediawiki/extensions/Cite@wmf/1.46.0-wmf.15] Parsoid: Add safeguard when checking for reflist template

https://gerrit.wikimedia.org/r/1239573

Mentioned in SAL (#wikimedia-operations) [2026-02-17T08:37:36Z] <wmde-fisch@deploy2002> Started scap sync-world: Backport for [[gerrit:1239573|Parsoid: Add safeguard when checking for reflist template (T416630)]]

Mentioned in SAL (#wikimedia-operations) [2026-02-17T08:41:51Z] <wmde-fisch@deploy2002> wmde-fisch: Backport for [[gerrit:1239573|Parsoid: Add safeguard when checking for reflist template (T416630)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.

Mentioned in SAL (#wikimedia-operations) [2026-02-17T08:48:26Z] <wmde-fisch@deploy2002> Finished scap sync-world: Backport for [[gerrit:1239573|Parsoid: Add safeguard when checking for reflist template (T416630)]] (duration: 10m 51s)