Some addons, including our own editorial system are lacking when it comes to completing the information needed to avoid the above error.
Is it technically possible to link the above text through to the actual page? If so, could we do it please?
The us admin can track down the culprit?
But the controller and action is, @Stuart Wright, so to debug this, get the user's ID, then look them up with this query:
SELECT user.user_id, user.username, activity.controller_name,
FROM xf_session_activity AS activity
LEFT JOIN xf_user AS user ON
(user.user_id = activity.user_id)
WHERE user.user_id = 9999
That should return something like this:
It would be awesome if this information was available in the front end somewhere (maybe in debug mode only on the member card).