This regression was introduced by
This showed up on IU's deployment of msgcntr 2.7.4. It isn't exactly clear what perfect circumstances occurred for this piece of code to be called, but the code itself is a guaranteed NPE if it is called. The symptom was that any time a user tried to send a message to "All Participants" it hit an NPE. It appears to be related to users who have not logged in to the tool yet so do not yet have a "private forum" in the db behind the scenes but somehow auto-forwarding is on by default for that user.
This error does not occur in trunk because it was picked up by a code cleanup utility in a separate jira that was merged into 2.7.x and 2.8.x before
MSGCNTR-312 was merged.