Warrior UI restarts in a loop

[s4y]

I just tried pointing a warrior, which I'm running with Docker, at the NewsGrabber project. When I select the project, I see some (unhelpful) output in the debug log, and then this message:

There is no connection with the warrior.

The warrior software seems to be restarting in a loop. If I select another project, this stops. Is this a known issue? Is NewsGrabber still an active project?

2019-01-24 15:26:13,761 - seesaw.warrior - DEBUG - Update warrior hq.
2019-01-24 15:26:13,761 - seesaw.warrior - DEBUG - Warrior ID '20829'.
2019-01-24 15:26:14,259 - seesaw.warrior - DEBUG - Select project newsgrabber
2019-01-24 15:26:14,260 - seesaw.warrior - DEBUG - Start selected project newsgrabber (reinstall=False)
2019-01-24 15:26:14,262 - seesaw.warrior - DEBUG - Install project newsgrabber
2019-01-24 15:26:14,272 - seesaw.warrior - DEBUG - git pull from https://github.com/ArchiveTeam/NewsGrabber-Warrior/
2019-01-24 15:26:14,796 - seesaw.warrior - DEBUG - git operation: Already up-to-date.