"Wikimedia\Assert\PreconditionException: Precondition failed: This Title instance does not represent an existing page" when trying to move page into main namespace
Closed, ResolvedPublicPRODUCTION ERROR
Actions

Assigned To

Authored By

	Msz2001
	Apr 6 2025, 7:27 PM

Description

Recently on Polish Wikipedia there have been reported a few instances of PreconditionException being thrown when a user tried to move a page from their user namespace to the main namespace. The issue is not specific to the given page (eg. after asking for help, other user was able to move it), the same user was also able to move the page to a different title than the original.

Error message (on Special:Move, after submitting):

Other noted request ids:

[caf1fd60-e78d-4d54-bab3-506c7ca9b705] 2025-04-04 14:48:06: Krytyczny wyjątek typu „Wikimedia\Assert\PreconditionException”
[2b2dd43b-bb6e-4a4c-8fa7-2a4531c670cd] 2025-04-06 09:29:15: Krytyczny wyjątek typu „Wikimedia\Assert\PreconditionException”
[38001a3a-856e-455c-874b-106b27201508] 2025-04-06 18:58:20: Krytyczny wyjątek typu „Wikimedia\Assert\PreconditionException”

The above three have been reported on plwiki's new user helpdesk.

Error

mwversion: 1.44.0-wmf.23
reqId: caf1fd60-e78d-4d54-bab3-506c7ca9b705
Find reqId in Logstash

normalized_message

[{reqId}] {exception_url}   Wikimedia\Assert\PreconditionException: Precondition failed: This Title instance does not represent an existing page: Anastole

Frame	Location	Call
from	/srv/mediawiki/php-1.44.0-wmf.23/vendor/wikimedia/assert/src/Assert.php(49)
#0	/srv/mediawiki/php-1.44.0-wmf.23/includes/title/Title.php(3873)	Wikimedia\Assert\Assert::precondition(bool, string)
#1	/srv/mediawiki/php-1.44.0-wmf.23/includes/page/MovePage.php(747)	MediaWiki\Title\Title->toPageRecord()
#2	/srv/mediawiki/php-1.44.0-wmf.23/includes/page/MovePage.php(495)	MediaWiki\Page\MovePage->moveUnsafe(MediaWiki\User\User, string, bool, array)
#3	/srv/mediawiki/php-1.44.0-wmf.23/includes/specials/SpecialMovePage.php(786)	MediaWiki\Page\MovePage->moveIfAllowed(MediaWiki\User\User, string, bool)
#4	/srv/mediawiki/php-1.44.0-wmf.23/includes/specials/SpecialMovePage.php(225)	MediaWiki\Specials\SpecialMovePage->doSubmit()
#5	/srv/mediawiki/php-1.44.0-wmf.23/includes/specialpage/SpecialPage.php(729)	MediaWiki\Specials\SpecialMovePage->execute(null)
#6	/srv/mediawiki/php-1.44.0-wmf.23/includes/specialpage/SpecialPageFactory.php(1737)	MediaWiki\SpecialPage\SpecialPage->run(null)
#7	/srv/mediawiki/php-1.44.0-wmf.23/includes/actions/ActionEntryPoint.php(499)	MediaWiki\SpecialPage\SpecialPageFactory->executePath(string, MediaWiki\Context\RequestContext)
#8	/srv/mediawiki/php-1.44.0-wmf.23/includes/actions/ActionEntryPoint.php(143)	MediaWiki\Actions\ActionEntryPoint->performRequest()
#9	/srv/mediawiki/php-1.44.0-wmf.23/includes/MediaWikiEntryPoint.php(202)	MediaWiki\Actions\ActionEntryPoint->execute()
#10	/srv/mediawiki/php-1.44.0-wmf.23/index.php(58)	MediaWiki\MediaWikiEntryPoint->run()
#11	/srv/mediawiki/w/index.php(3)	require(string)
#12	{main}

Impact

Notes

Details

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	READ_LATEST for toPageRecord in eventDispatcher	mediawiki/core	master	+2 -2

Customize query in gerrit

Event Timeline

Msz2001 created this task.Apr 6 2025, 7:27 PM

Restricted Application changed the subtype of this task from "Bug Report" to "Production Error". · View Herald TranscriptApr 6 2025, 7:27 PM

Restricted Application added a subscriber: Aklapper. · View Herald Transcript

A_smart_kitten added a project: MediaWiki-Page-rename.Apr 6 2025, 7:30 PM

A_smart_kitten subscribed.

Piastu subscribed.Apr 6 2025, 7:33 PM

IOIOI subscribed.Apr 6 2025, 7:34 PM

PeterBowman subscribed.Apr 6 2025, 7:35 PM

Aklapper renamed this task from Wikimedia\Assert\PreconditionException when trying to move page into main namespace to "Wikimedia\Assert\PreconditionException: Precondition failed: This Title instance does not represent an existing page" when trying to move page into main namespace.Apr 6 2025, 7:45 PM

Aklapper updated the task description. (Show Details)

Bugreporter added a project: MediaWiki-DomainEvents.Apr 6 2025, 7:51 PM

Change #1134386 had a related patch set uploaded (by Wargo; author: Wargo):

[mediawiki/core@master] READ_LATEST for toPageRecord in eventDispatcher

https://gerrit.wikimedia.org/r/1134386

gerritbot added a project: Patch-For-Review.Apr 6 2025, 10:40 PM

Wargo subscribed.Apr 6 2025, 10:44 PM

Change #1134386 merged by jenkins-bot:

[mediawiki/core@master] READ_LATEST for toPageRecord in eventDispatcher

https://gerrit.wikimedia.org/r/1134386

ReleaseTaggerBot added a project: MW-1.44-notes (1.44.0-wmf.25; 2025-04-15).Apr 11 2025, 9:00 AM

Maintenance_bot removed a project: Patch-For-Review.Apr 11 2025, 9:30 AM

Reedy moved this task from Untriaged to Apr-Jun 2025 on the Wikimedia-production-error board.Apr 14 2025, 5:40 PM

Tagging in MediaWiki-Engineering if this is incorrect, please help direct to the appropriate team or use Unstewarded-production-error if no such team exists.