I got this traceback in an email today. I have no clue what caused it, I doubt anyone was messing around with anything at the time that it happened and there were no crashes or anything around the time that it happened either.
See BIT-602. This looks like it's fixed in trace-summary master branch for me, but just the broctl submodule for it needs to be updated.
A fresh install doesn't give me this anymore: an update to broctl's trace-summary submodule fixed it.
Milestone Bro2.0 deleted