Put the summary of the bug you're having here

What I expected to happen was...:

I expected coal to not crash the game when I put it in a furnace.

What actually happened was...:

I left off yesterday in my mine, and when I came back today, the update was ready, so I updated to 16w39a. But after the update, I tried to put coal in a furnace to smelt my iron, gold etc. and it crashed the game on 3 occasions. Before the update, I was very capable of putting coal in a furnace (;

FIVE MINS LATER
I tried to use a hopper to get the coal inside, and now I can't even get into my game... Please fix this asap...

Steps to Reproduce:
1. Acquire a piece of coal, a furnace and iron ore.
2. SHIFT CLICK (cause thats what I did) the coal into the furnace.
3. Boom. Crash.