No sound + NPE in 13w21a

Here is a link to the Dev log file: https://dl.dropboxusercontent.com/u/10679993/13w21aError.txt

There are notable errors regarding sound initalization as well as a null pointer somewhere in there as well. The null pointer did not crash Minecraft.

Edit: I should note that the sound stopped working as soon as I created a new test world. It was working fine in the menu.