When spawning in a mobappearance with the /particle command as such:

/particle mobappearance ~ ~ ~ 0 0 0 0

The command works for the first time, but if any other particles have been spawned before (such as a mobappearance), the game will crash with the attached report.

What I expected to happen was...:
Another mobappearance particle appearing.

What actually happened was...:
The game crashed

Steps to reproduce...:
This is the easiest way:
1. Use the aforementioned command.
2. Try to run it again and again.

EDIT: It appears that the command will sometimes crash from the first time, but in other times it can take lots of tries to crash the game