As long as villager dies,Minecraft will crash!!

What I expected to happen was...:
I am a Chinese player and I love Minecraft.I want to try this new snapshot ,so I tried it.I killed a villager by accident ,then Minecraft crashed!

What actually happened was...:
I try to create a new world to proof my guess,I found that no matter how the villagers die,Minecraft will crash!Even the command''/kill ''

Steps to Reproduce:

1. Spawn a villager in a world
2. Kill it by players
3. Kill it by zombies or illagers

4.Kill it by lava and so on

5.No matter what ,Minecraft will crash!