Game Crash by entering a Dropper with Playerhead inside

If I change the blockdata of a Dropper with the following Command
the Game crashes when I want to open the dropper. Even after restart!

I destroyed the Dropper(the Block), it crashed again, I joined again.. CRASH...Endless Loop!
I NEED THIS WORLD, I DID SO MANY WORK IN THIS WORLD!!

COMMAND:

/blockdata ~ ~-1 ~ {Items:[{Slot:4b,id:"minecraft:skull",Count:1b,Damage:0s,tag:{display:{Name:"Pokeball"},SkullOwner:{Id:"Chuzard"}}}]}

What I expected to happen was nothing unusual..

What actually happened was CRASH

Steps to Reproduce:
1.I
2.told
3.above