Noticed in Fatal-Monitor after deploying 1.33.0-wmf.8 to group1
[{exception_id}] {exception_url} BadMethodCallException from line 394 of /srv/mediawiki/php-1.33.0-wmf.8/extensions/EventBus/includes/EventBus.php: Call to a member function format() on a non-object (boolean)
Reoccurance of T210608