Creating a superflat world with this code: 2;7,2x3,46,70,0,20;, breaking the class and falling through causes the game to crash.

What I expected to happen was...:
Not entire sure actually, but I hoped the game would still function

What actually happened was...:
The game crashed.

Steps to Reproduce:
1. Create superflat world with 2;7,2x3,46,70,0,20;
2. Break a glass block
3. Step into opening

I understand if nothing is done about this, but I figured I would post it anyways. Seems the game should have a better way of handling this.