The game seems to crash whenever the render distance has been switched (too fast, maybe?). Moving the render distance "bar" with the mouse will freeze the game for a few seconds and ultimately crash it. Also, it only seems to happen when in a game. Being on the main menu does not crash the game, so it could be assumed it's a problem related to chunk loading upon render distance switching.

Error Log below

http://pastebin.com/XQpr8Asm