Bukkit

What steps will reproduce the problem?
1.Join normally in a game with two players, but so that the other player leaves the game before the countdown ends.
2.
3.

What is the expected output? What do you see instead?
The game continue normally

What version of the product are you using?
PaintWar v1.0.2

Do you have an error log of what happened?
yes: http://pastebin.com/SZjCReUe

Please provide any additional information below.
The error does not effect gameplay at all, but it literally kills the console.