Crash when changing certain control

I tried to change a control in a new snapshot and Minecraft crashed.

What I expected to happen:
When I click Voice Chat under the Controls Menu and hit P, Minecraft would change the control.

What realy happened:
When I tried to change the control, Minecraft crashed.

Steps to reproduce:
1. Click Options
2. Click Controls
3. Click "Voice Chat"
4. Hit any key

Didnt come with a Minecraft crash log, apparently Java faced an error.