when you get a command block and type "summon Shulker (Co-ordinates) it crashes your game (it happened to me idk if it will happen to anyone else) and also the bug happens on 15w33b not 1.7 15w33b didnt exist lol

Put the summary of the bug you're having here

What I expected to happen was...:
spawn a shulker at the coordinates i sayed

What actually happened was...:
my game crashed!

Steps to Reproduce:
1. Get a command block
2. Type "Summon Shulker (Coordinates)"
3. get a lever/redstone block and activate it.