Seen in production:
ERROR: [V@7lRQpAAEUAADO0OyIAAACD] /w/load.php?debug=false&lang=ja&modules=startup&only=scripts&skin=modern BadMethodCallException from line 362 of /srv/mediawiki/php-1.28.0-wmf.20/includes/resourceloader/ResourceLoaderWikiModule.php: Call to a member function getPrefixedText() on a non-object (null)