[MC-35787] Application crash when pressing volume control in 13w42a

Application crashes when the user changes the friendly mobs volume control.

throws null pointer exception.

Linked issues

confirmed
1: music & sound
2: hostile mobs -> touch slider -> crash

Confirmed. Every time when I try to adjust the volume level for friendly mobs, the game crashes.

Confirmed. Happens to me too.

Blaine W Flowers 2013-10-19T12:20:29Z

Confirmed, same error when clicking on the Blocks volume slider.