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Special:MyLanguage throws TypeError
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Description

For example https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents

Some of the time I get a 503 error page, other times the wiki loads but shows the exception:

[XjnyCgpAICAAAGmpJE4AAAFW] 2020-02-04 22:36:58: Fatal exception of type "TypeError"

From logstash:

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

This seems to be specific to 1.35.0-wmf.18