I think I know the reason for that, I suggest reverting to the revision before it until I can commit a fix.these errors just appeared when I started a 600 AD game as Italy:
Error in cityAcquired event handler <bound method CvRFCEventHandler.onCityAcquired of <CvRFCEventHandler.CvRFCEventHandler instance at 0x175DD1C0>>
edit:
They appear again and again at some turns. So far I noticed no actual errors in the game
2nd Edit:
Around 1444 the game always crashes when I go for the next turn.
(as Italy with Genoa, Venice, Rome)