[Client Errors] TAHS - TypeError: Cannot read property '0' of undefined
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	LMora-WMF
	Jun 18 2025, 6:19 PM

Description

Several client errors appeared via alert emails and can be seen on logstash: https://logstash.wikimedia.org/app/dashboards#/view/AXDBY8Qhh3Uj6x1zCF56?_g=h@67649a6&_a=h@b22e7b4

Most errors are on English Wikipedia
Errors are related to TAHS and the ResizeObserver.
Main error message is TypeError: Cannot read property '0' of undefined

stack_trace at ResizeObserver.<anonymous> https://en.m.wikipedia.org/w/load.php?lang=en&modules=mediawiki.codex.typeaheadSearch%7Cvue&skin=minerva&version=ldg5d:14:347

Revert patch: https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/1159542

Details

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	Update Codex from v2.1.0 to v2.2.0	mediawiki/core	master	+631 -203
	useResizeObserver: Check for valid ResizeObserver entry	design/codex	main	+3 -3

Customize query in gerrit

Event Timeline

LMora-WMF created this task.Jun 18 2025, 6:19 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJun 18 2025, 6:19 PM

LMora-WMF added a project: Web-Team.Jun 18 2025, 6:20 PM

Jdrewniak triaged this task as High priority.Jun 23 2025, 5:19 PM

Jdrewniak moved this task from Incoming to Q4 on the Web-Team board.Jun 23 2025, 5:24 PM

Change #1162991 had a related patch set uploaded (by Bernard Wang; author: Bernard Wang):

[design/codex@main] useResizeObserver: Check for valid ResizeObserver entry

https://gerrit.wikimedia.org/r/1162991

gerritbot added a project: Patch-For-Review.Jun 23 2025, 5:45 PM

seems like a browser support issue, all the errors are from firefox/android https://logstash.wikimedia.org/app/dashboards#/view/AXDBY8Qhh3Uj6x1zCF56?_g=h@218e8f9&_a=h@2f0339b
the problematic code is in codex, useResizeObserver composable, which is used by codex dialog

dunno how accurate user agents are in general, but the most errors seems to be coming from kindles

bwang moved this task from Q4 to Q4 Sprint 6 (June 18 - July 2 2025) on the Web-Team board.Jun 23 2025, 6:38 PM

bwang edited projects, added Web-Team (Q4 Sprint 6 (June 18 - July 2 2025)); removed Web-Team.

Change #1162991 merged by jenkins-bot:

[design/codex@main] useResizeObserver: Check for valid ResizeObserver entry

https://gerrit.wikimedia.org/r/1162991

Maintenance_bot removed a project: Patch-For-Review.Jun 23 2025, 7:31 PM

LMora-WMF moved this task from Ready for development to In-progress on the Web-Team (Q4 Sprint 6 (June 18 - July 2 2025)) board.Jun 24 2025, 3:43 PM

Change #1163459 had a related patch set uploaded (by Anne Tomasevich; author: Anne Tomasevich):

[mediawiki/core@master] Update Codex from v2.1.0 to v2.2.0

https://gerrit.wikimedia.org/r/1163459

gerritbot added a project: Patch-For-Review.Jun 24 2025, 8:28 PM