When visiting https://translatewiki.net/wiki/Special:Translations/MediaWiki:Logentry-newusers-create2, there is an internal error:

Internal error
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Language::isValidBuiltInCode must be passed a string, boolean given

Backtrace:

#0 /www/translatewiki.net/w/languages/Language.php(204): Language::isValidBuiltInCode(false)
#1 /www/translatewiki.net/w/languages/Language.php(185): Language::newFromCode(false)
#2 /www/translatewiki.net/w/extensions/Translate/specials/SpecialTranslations.php(237): Language::factory(false)
#3 /www/translatewiki.net/w/extensions/Translate/specials/SpecialTranslations.php(63): SpecialTranslations->showTranslations(Object(Title))
#4 /www/translatewiki.net/w/includes/SpecialPage.php(612): SpecialTranslations->execute('MediaWiki:Logen...')
#5 /www/translatewiki.net/w/includes/SpecialPageFactory.php(501): SpecialPage->run('MediaWiki:Logen...')
#6 /www/translatewiki.net/w/includes/Wiki.php(291): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#7 /www/translatewiki.net/w/includes/Wiki.php(555): MediaWiki->performRequest()
#8 /www/translatewiki.net/w/includes/Wiki.php(448): MediaWiki->main()
#9 /www/translatewiki.net/w/index.php(59): MediaWiki->run()
#10 {main}

Version: unspecified
Severity: normal
URL: https://translatewiki.net/wiki/Special:Translations/MediaWiki:Logentry-newusers-create2