deathmarine/Achievement — pull request #1 by Bootscreen (2012-02-16 11:05:52+00:00)
Title: fixed bug when damager isn't a player

this short code prevent errors when the damager is not a player, e.g. when a skeleton…

it's a solution of this problem: http://dev.bukkit.org/server-mods/achievement/tickets/4-monster-entries-dmg-and-crafting-issue/