I was playing in my world where I test new snapshot features, and I decided to look into the new GUI of horses. I went around messing with them, and I decided to open the inventory of a skeleton horse. This horse has a chest for storage. As I did, the game went to a pattern of dirt, then crashed the game. Not only did it crash the game, but when I went back, the skeleton horse disappeared! I just now tested it on an undead, or zombie horse, and it crashed too! (It also had a chest) This really bugged me.
It, however, does NOT crash when you open the GUI of a zombie/skeleton horse without a chest.

How to reproduce:
1) Use an NBTEditor to modify a horse to be a zombie/skeleton horse. Be sure to add a chest to the horse in an NBTEditor too, because you can't in game!
2) Load the world with the horse, and open the inventory.
3) Minecraft should crash
4) *OPTIONAL: Cry because your skeleton/zombie horse is gone. :c *

Thanks for taking time to read this, and please do fix it!

-PieMakerFilms