Non-admins cannot see inactive user records per a Business Rule. This problem arises due to the @mention service not filtering out inactive users explicitly, and thus when we impersonate to determine whether or not a user can view a record the next user in the list cannot be retrieved properly.
Steps to Reproduce
2.Open any incident which is active.
3.In the Additional Comments, enter "@user" (This is to use the Activity Stream @mention email).
4.Enter any text and select save to commit the changes.
5.Session logout is seen.
The issue has been addressed in Jakarta patch 9 and Kingston Patch 6.
Related Problem: PRB716458