Crashing all the time :(

I don't know if it's just my computer acting up, but whenever I summon an entity (including when placing item frames, since, as you know, they are entities) my game crashes. (Not ALL entities, but most.)

I was expecting the entity to be spawned, as it usually does.

But, when I powered the command block (here's the command, just in case:

/summon FallingSand ~ ~1 ~ {TileID:wool,Data:9,DropItem:0,Motion:[0.0,1.0,0.0]}

the game just crashed. I retried several times, but the game crashed every time.

And again, I'm not sure if it's just my computer that is somehow making it crash.

Steps to Reproduce:
1. Summon any kind of entity.
2. Keep trying if it does not work with the first try.

If it does not happen, I guess it's just my computer.

Thank you,
Twisted_Ender