Seen on #minecrafthelp two different users with the same issue after updating their maps to 1.11.1(from 1.11)

Logs: https://paste.ubuntu.com/23661231/ https://paste.ubuntu.com/23660818/

Removing the entity with mcedit seems to fix it until another one appears, so it might affect all chickens in the map

The crash seems to happen when the world is being loaded

World is still being uploaded, will edit when its done