When I try to turn the sound or music up in Minecraft, I crash.

My music and sound are muted. When I try to turn the sound or music up in Minecraft, I crash.

What I expected to happen was...:
For it to slide to 100%.

What actually happened was...:
Crash the executable.

Steps to Reproduce:
1. Go into options on the latest snapshot version.
2. Click on the music or sound sliders and try moving them.
3. Congratulations, I got you to crash your executable!