I was playing PVP on my server, and it crashed. I dont know what caused it, so, yeah. It's here: http://pastie.org/8017191
I suggest you either look up this bug, or create one if one doesn't exist, on http://leaky.bukkit.org/
Locked. This is not a bug to be reported to leaky - as necrodoom said, its world corruption. Not to mention this is an offline mode server - we do not support offline mode servers.