I just switched to Minecraft version Snapshot 15w44b. I load a new world, but right when I spawn in the game crashes.

I expected to play the snapshot, but every time I load a new world, I instantly crash.

I switched to snapshot 15w44b. I saved my profile. I loaded Minecraft. I started up a new world. I spawn in the world. Minecraft instantly crashes.

Steps to Reproduce:
1. Load the Minecraft Launcher
2. Press "Edit Profile"
3. Click the box under "Version Selector" that says "Enable experimental development versions ("snapshots")
4. Click the down arrow right beside "Use Version:"
5. Choose "15w44b" and press "Save Profile"
6. Press the big "Play" button
7. Once Minecraft loads, press "Single Player"
8. Open a new world