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Multiple links on MediaWiki throwing : Fatal exception of type "TypeError"
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Description

Steps to Reproduce:
Go to https://www.mediawiki.org/wiki/MediaWiki
Click on "Get Extensions" or "Contribute" or "FAQ" etc. in the sidebar
However, if you refresh the page, the error goes away.

Exception ID: XjrqvApAIC4AAGbYhCMAAABM

Link to kibana error: https://logstash.wikimedia.org/app/kibana#/doc/logstash-*/logstash-deploy-2020.02.05/mediawiki?id=AXAWJPTSarkxubcmtOZw&_g=h@44136fa

"Argument 1 passed to Title::getLanguageConverter() must be an instance of Language, instance of StubUserLang given, called in /srv/mediawiki/php-1.35.0-wmf.18/includes/Title.php on line 207"

Actual Results:

Fatal exception of type "TypeError"

Expected Results:

Directed to page.

Event Timeline

nnikkhoui created this task.Feb 5 2020, 4:14 PM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptFeb 5 2020, 4:14 PM
nnikkhoui triaged this task as Unbreak Now! priority.Feb 5 2020, 4:15 PM
Restricted Application added a subscriber: Liuxinyu970226. · View Herald TranscriptFeb 5 2020, 4:15 PM
nnikkhoui updated the task description. (Show Details)Feb 5 2020, 4:19 PM
nnikkhoui updated the task description. (Show Details)
Ammarpad added a subscriber: Ammarpad.EditedFeb 5 2020, 4:27 PM

This is duplicate of T244300. A hotfix has been made already.

(If anyone is sure that this is a duplicate, then feel free to Edit Related Tasks...Close As Duplicate in the upper right corner. Thanks.)

Aklapper changed the subtype of this task from "Bug Report" to "Production Error".

(Switching task type to "Production error"; adding code project; marking as duplicate)

Restricted Application removed a subscriber: Liuxinyu970226. · View Herald TranscriptFeb 5 2020, 5:04 PM