'TypeError: imeLanguageList.forEach is not a function' when editing Commons pages
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Description

The error seen in attached screenshot appears while any edit window is open on Wikimedia Commons. It disappears after a few seconds but reappears once typing resumes. I have not encountered the error on any other project.

t mw.ime.getIMELanguageList URL1:1:1478
at mw.ime.addIme URL1:5:592
at mw.ime.handleFocus URL1:5:499
at mw.ime.setup/< URL1:5:44
at dispatch URL2:193:742
at add/elemData.handle URL2:190:388
at trigger URL2:239:596
at simulate URL2:240:460
at handler URL2:240:843

URL1: https://meta.wikimedia.org/w/load.php?lang=en&modules=ext.uls.i18n%2Cime%2Clanguagenames%2Cmediawiki%2Cmessages%7Cjquery.i18n%2Cime%2Culs%7Cjquery.uls.grid&skin=vector&version=1n1zi
URL2: https://meta.wikimedia.org/w/load.php?lang=en&modules=ext.TemplateWizard%2Ccharinsert%2CeventLogging%2CnavigationTiming%2CwikimediaEvents%7Cext.TwoColConflict.JSCheck%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.echo.api%2Cinit%7Cext.uls.common%2Ccompactlinks%2Cinit%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Cmoment%2Coojs%2Coojs-ui-core%2Coojs-ui-toolbars%2Coojs-ui-widgets%2Coojs-ui-windows%2Csite%7Cjquery.client%2Ccookie%2ClengthLimit%2CmakeCollapsible%2CtextSelection%7Cjquery.makeCollapsible.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2Cicon%2CjqueryMsg%2Clanguage%2Cstorage%2Cuser%2Cutil%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.action.edit%7Cmediawiki.action.edit.collapsibleFooter%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmediawiki.ui.button%7Cmediawiki.widgets.DateInputWidget%2CUserInputWidget%2CvisibleLengthLimit%7Cmediawiki.widgets.DateInputWidget.styles%7Coojs-ui-toolbars.icons%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-content%2Cicons-interactions%2Cicons-movement%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=kj8an

Steps to reproduce

Enable input methods
Execute this on console: $.ime.preferences.registry.previousLanguages = '["en"]'
Activate an input field

This corrupted value can be persisted by now opening ULS input preferences, doing a change and saving. The proposed patch will ignore corrupted values on load.

Expected outcome

Corrupted input method preference values will not prevent input methods from working and log spam is gone.

Details

	Project	Branch	Lines +/-	Subject
	mediawiki/extensions/UniversalLanguageSelector	master	+13 -0	Handle corrupted values in input preferences

Customize query in gerrit

Related Objects

Duplicates Merged Here: T183483: getIMELanguageList error reported for seemingly unrelated issues

Event Timeline

Juliancolton created this task.Feb 27 2020, 6:35 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptFeb 27 2020, 6:35 PM

AntiCompositeNumber added a project: UniversalLanguageSelector.Feb 27 2020, 6:37 PM

AntiCompositeNumber added a subscriber: AntiCompositeNumber.

Are you using Internet Explorer?

In T246370#5924419, @Nikerabbit wrote:

Are you using Internet Explorer?

The latest version of Firefox. I can reproduce the issue on other browsers, though.

When you observe this error, can you execute these lines of code one by one in your browser's JavaScript console and paste here what it returns:

$.ime.preferences.getPreviousLanguages();

localStorage.getItem( 'uls-previous-languages' );

In T246370#5925768, @Nikerabbit wrote:
When you observe this error, can you execute these lines of code one by one in your browser's JavaScript console and paste here what it returns:
$.ime.preferences.getPreviousLanguages();

localStorage.getItem( 'uls-previous-languages' );

$.ime.preferences.getPreviousLanguages();
"[\"en\"]"

localStorage.getItem( 'uls-previous-languages' );
"[\"fromgov\",\"ownwork\",\"en\"]"

First value is corrupted, it should be an array, not a string. Are you logged in or logged out?

I'm logged in.

Quite a few of these are showing up in our logstash instance.
https://logstash.wikimedia.org/app/kibana#/doc/logstash-*/logstash-2020.09.16/clienterror/?id=AXSWwi8zLNRtRo5Xwcbu

at mw.ime.getIMELanguageList URL1:1:1478
at mw.ime.addIme URL1:5:592
at mw.ime.handleFocus URL1:5:499
at mw.ime.setup/< URL1:5:44
at dispatch URL2:200:742
at add/elemData.handle URL2:197:388
at trigger URL2:246:596
at simulate URL2:247:460
at handler URL2:247:843

URL1: https://meta.wikimedia.org/w/load.php?lang=en&modules=ext.uls.i18n%2Cime%2Clanguagenames%2Cmediawiki%2Cmessages%7Cjquery.i18n%2Cime%2Culs%7Cjquery.uls.grid&skin=vector&version=1ushi
URL2: https://meta.wikimedia.org/w/load.php?lang=en&modules=ext.TemplateWizard%2Ccharinsert%2CeventLogging%2CnavigationTiming%2CwikimediaEvents%7Cext.TwoColConflict.JSCheck%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.echo.api%2Cinit%7Cext.uls.common%2Ccompactlinks%2Cinit%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.wikimediaEvents.loggedin%7Cjquery%2Cmoment%2Coojs%2Coojs-ui-core%2Coojs-ui-toolbars%2Coojs-ui-widgets%2Coojs-ui-windows%2Csite%7Cjquery.client%2Ccookie%2ClengthLimit%2CmakeCollapsible%2CtextSelection%7Cjquery.makeCollapsible.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2Cicon%2CjqueryMsg%2Clanguage%2Cstorage%2Cuser%2Cutil%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.action.edit%7Cmediawiki.action.edit.collapsibleFooter%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmediawiki.ui.button%7Cmediawiki.widgets.DateInputWidget%2CUserInputWidget%2CvisibleLengthLimit%7Cmediawiki.widgets.DateInputWidget.styles%7Coojs-ui-toolbars.icons%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-content%2Cicons-interactions%2Cicons-movement%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=ninfb

Jdlrobson moved this task from Untriaged to Old on the Wikimedia-production-error board.Sep 16 2020, 6:49 PM

Umherirrender added a project: JavaScript.Sep 16 2020, 7:57 PM

Jdlrobson updated the task description. (Show Details)Sep 23 2020, 10:03 PM

This is a frequent error. Fixing it seems simple.

Pginer-WMF edited projects, added Language-Team (Language-2020-October-December); removed Language-Team (Language-2020-July-September).Oct 2 2020, 3:23 PM

This error is now the #7 most frequent.

Is that because others got fixed or this one got more frequent?

Change 657050 had a related patch set uploaded (by Nikerabbit; owner: Nikerabbit):
[mediawiki/extensions/UniversalLanguageSelector@master] Handle corrupted values in input preferences

https://gerrit.wikimedia.org/r/657050

gerritbot added a project: Patch-For-Review.Jan 19 2021, 8:44 AM

Nikerabbit updated the task description. (Show Details)Jan 19 2021, 8:48 AM

Nikerabbit moved this task from Quarter Backlog to In Review on the Language-Team (Language-2021-January-March) board.

Nikerabbit moved this task from Backlog to Performance and stability on the UniversalLanguageSelector board.

Nikerabbit claimed this task.Jan 19 2021, 8:51 AM

Nikerabbit merged a task: T183483: getIMELanguageList error reported for seemingly unrelated issues.

Nikerabbit added subscribers: • Petar.petkovic, matmarex, Danmichaelo and 11 others.

Change 657050 merged by jenkins-bot:
[mediawiki/extensions/UniversalLanguageSelector@master] Handle corrupted values in input preferences

https://gerrit.wikimedia.org/r/657050

Maintenance_bot removed a project: Patch-For-Review.Jan 19 2021, 8:10 PM

ReleaseTaggerBot added a project: MW-1.36-notes (1.36.0-wmf.28; 2021-01-26).Jan 19 2021, 9:00 PM

Nikerabbit moved this task from In Review to Needs QA on the Language-Team (Language-2021-January-March) board.Jan 20 2021, 6:52 AM

@Nikerabbit can you find this error in logstash?
I searched for "getIMELanguageList" and couldn't find any error in the last week

You can use this dashboard to track errors in language engineering products:
https://logstash.wikimedia.org/goto/3473af6723105453182f2bd096b4168c

thanks @Jdlrobson , I was looking for the wrong string

let's wait a week after this is deployed in production to see if the error disappears
https://logstash.wikimedia.org/app/dashboards#/view/AXDBY8Qhh3Uj6x1zCF56?_g=(filters%3A!()%2CrefreshInterval%3A(pause%3A!f%2Cvalue%3A1800000)%2Ctime%3A(from%3Anow-7d%2Cto%3Anow))

Esanders removed a subscriber: Esanders.Jan 23 2021, 3:31 PM

The error is still present today. Strangely it seems to occur a lot of no.wikipedia.org (as do a lot of other ULS errors) when the nb language is set.
Is there something special about that wiki / language ?

As far as I can see this is still not yet deployed.

Trizek-WMF removed a subscriber: Trizek-WMF.Feb 8 2021, 4:48 PM

Not sure if there is something wrong with Logstash, but I can't find any signs of this error even if I search for past 3-4 weeks.

Nikerabbit moved this task from Recheck after deployment to Needs QA on the Language-Team (Language-2021-January-March) board.Feb 18 2021, 9:13 AM