Exception Popup

I get system dialog box pop:

"Unrecognized task serialized by server, missing registration?"

Please help!!!

This started happening to me tonight as well. I have never seen this error before (my game has hardly crashed at all since day 1 early access).

Exception
Unrecognised task serialised by the server; missing registration?

How to recreate crash:
- 2 person party (I am host)
- I open map from within my hideout (other party member is present in my hideout)
- We both enter map (the order doesn't seem to matter)
- I leave map via portal (after we were both inside map)
- I try to re-enter map from my hideout
- Get "Exception" (crash) during loading screen

Opening a new map works fine, but the crash will begin again as soon as I leave the map and try to re-enter.