PHP Warning: Undefined array key "section"
Closed, ResolvedPublicPRODUCTION ERROR
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Description

Error

mwversion: 1.46.0-wmf.26
timestamp: 2026-04-29T22:38:09.590Z
phpversion: 8.3.30
reqId: b7961f06-2fcf-4eac-bc82-fe71487794a1
Find reqId in Logstash

normalized_message

[{reqId}] {exception_url}   PHP Warning: Undefined array key "section"

Frame	Location	Call
from	/srv/mediawiki/php-1.46.0-wmf.26/extensions/GlobalPreferences/includes/GlobalPreferencesFactory.php(325)
#0	/srv/mediawiki/php-1.46.0-wmf.26/extensions/GlobalPreferences/includes/GlobalPreferencesFactory.php(325)	MediaWiki\Exception\MWExceptionHandler::handleError(int, string, string, int)
#1	/srv/mediawiki/php-1.46.0-wmf.26/extensions/GlobalPreferences/includes/GlobalPreferencesFactory.php(177)	GlobalPreferences\GlobalPreferencesFactory->getPreferencesGlobal(MediaWiki\User\User, array, array, MediaWiki\Context\RequestContext)
#2	/srv/mediawiki/php-1.46.0-wmf.26/includes/Preferences/DefaultPreferencesFactory.php(1997)	GlobalPreferences\GlobalPreferencesFactory->getFormDescriptor(MediaWiki\User\User, MediaWiki\Context\RequestContext)
#3	/srv/mediawiki/php-1.46.0-wmf.26/extensions/GlobalPreferences/includes/SpecialGlobalPreferences.php(74)	MediaWiki\Preferences\DefaultPreferencesFactory->getForm(MediaWiki\User\User, MediaWiki\Context\RequestContext, string)
#4	/srv/mediawiki/php-1.46.0-wmf.26/includes/Specials/SpecialPreferences.php(100)	GlobalPreferences\SpecialGlobalPreferences->getFormObject(MediaWiki\User\User, MediaWiki\Context\RequestContext)
#5	/srv/mediawiki/php-1.46.0-wmf.26/extensions/GlobalPreferences/includes/SpecialGlobalPreferences.php(64)	MediaWiki\Specials\SpecialPreferences->execute(null)
#6	/srv/mediawiki/php-1.46.0-wmf.26/includes/SpecialPage/SpecialPage.php(730)	GlobalPreferences\SpecialGlobalPreferences->execute(null)
#7	/srv/mediawiki/php-1.46.0-wmf.26/includes/SpecialPage/SpecialPageFactory.php(1720)	MediaWiki\SpecialPage\SpecialPage->run(null)
#8	/srv/mediawiki/php-1.46.0-wmf.26/includes/Actions/ActionEntryPoint.php(505)	MediaWiki\SpecialPage\SpecialPageFactory->executePath(string, MediaWiki\Context\RequestContext)
#9	/srv/mediawiki/php-1.46.0-wmf.26/includes/Actions/ActionEntryPoint.php(145)	MediaWiki\Actions\ActionEntryPoint->performRequest()
#10	/srv/mediawiki/php-1.46.0-wmf.26/includes/MediaWikiEntryPoint.php(180)	MediaWiki\Actions\ActionEntryPoint->execute()
#11	/srv/mediawiki/php-1.46.0-wmf.26/index.php(44)	MediaWiki\MediaWikiEntryPoint->run()
#12	/srv/mediawiki/w/index.php(3)	require(string)
#13	{main}

Impact

Notes

Highest rate production log at the moment.

Details

Request URL: https://www.mediawiki.org/wiki/Special:GlobalPreferences

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	GlobalPreferencesFactory: don't include hidden auto-globals in the form	mediawiki/extensions/GlobalPreferences	master	+0 -3

Customize query in gerrit

Related Objects

Mentioned In: T426761: PHP Warning: Undefined array key "wikimedia-donor"
Mentioned Here: T426761: PHP Warning: Undefined array key "wikimedia-donor"

Event Timeline

cscott created this task.Apr 29 2026, 10:44 PM

Restricted Application added a project: Community-Tech. · View Herald TranscriptApr 29 2026, 10:44 PM

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

SomeRandomDeveloper subscribed.May 1 2026, 1:02 PM

Change #1282367 had a related patch set uploaded (by MusikAnimal; author: MusikAnimal):

[mediawiki/extensions/GlobalPreferences@master] GlobalPreferencesFactory: don't include hidden auto-globals in the form

https://gerrit.wikimedia.org/r/1282367

gerritbot added a project: Patch-For-Review.May 4 2026, 2:04 PM

I believe this is coming from the wikimedia-donor preference added by WikimediaCustomizations

Recent patch for GlobalPrefs that exposes auto-globals as a disabled preference at Special:GlobalPreferences - https://gerrit.wikimedia.org/r/c/mediawiki/extensions/GlobalPreferences/+/1255008
WikimediaCustomizations patch that added the auto-global - https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikimediaCustomizations/+/1237607

wikimedia-donor is a hidden preference, meaning it shouldn't be exposed in Special:GlobalPreferences, but in GlobalPreferencesFactory::isGlobalizablePreference() we return true for auto-globals, ignoring the fact that the preference is hidden.

I think what we probably want is to just remove $this->isAutoGlobal( $name ) as a truthy condition in isGlobalizablePreference(). I've submitted a patch for that.

cc @Jdlrobson

MusikAnimal edited projects, added: Community-Tech (Sea Lion Squad); removed: Community-Tech.May 4 2026, 4:16 PM

MusikAnimal moved this task from Backlog - groomed to Feedback and Review on the Community-Tech (Sea Lion Squad) board.

MusikAnimal changed the task status from Open to In Progress.May 4 2026, 4:30 PM

Change #1282367 merged by jenkins-bot:

[mediawiki/extensions/GlobalPreferences@master] GlobalPreferencesFactory: don't include hidden auto-globals in the form

https://gerrit.wikimedia.org/r/1282367

ReleaseTaggerBot added a project: MW-1.47-notes (1.47.0-wmf.1; 2026-05-05).May 4 2026, 7:00 PM

Maintenance_bot removed a project: Patch-For-Review.May 4 2026, 7:30 PM

The warnings appear to have stopped as of 2026-05-04.

HakanIST mentioned this in T426761: PHP Warning: Undefined array key "wikimedia-donor".Tue, May 19, 5:44 PM

Likely caused T426761: PHP Warning: Undefined array key "wikimedia-donor".

PHP Warning: Undefined array key "section"Closed, ResolvedPublicPRODUCTION ERRORActions