Error
https://logstash.wikimedia.org/app/kibana#/doc/logstash-*/logstash-2020.09.09/clienterror/?id=AXR0XkapMQ_08tQaNqcf
https://gerrit.wikimedia.org/g/mediawiki/core/+/dcc88f70f414afbdb52c901960aacc112f18770d/resources/src/mediawiki.widgets/mw.widgets.CategoryTagItemWidget.js#127
MediaWiki version: n/a
Uncaught TypeError: Cannot read property 'getMainText' of null