HELP! Server crashes!

[Jimmy_Rustles]

Title: HELP! Server crashes!

Version: 3.1.2

OS: Linux

Java Version: Java 7

Description of Problem:

Server crashes with this error, no clue what's causing it.

Error Messages:

[3:15:42] java.lang.NullPointerException

[3:15:42] at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager.java:249)

[3:15:42] at net.minecraft.server.ItemInWorldManager.c(ItemInWorldManager.java:87)

[3:15:42] at net.minecraft.server.EntityPlayer.F_(EntityPlayer.java:144)

[3:15:42] at net.minecraft.server.World.entityJoinedWorld(World.java:1286)

[3:15:42] at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:111)

[3:15:42] at net.minecraft.server.World.playerJoinedWorld(World.java:1268)

[3:15:42] at net.minecraft.server.World.tickEntities(World.java:1164)

[3:15:42] at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:569)

[3:15:42] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)

[3:15:42] at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

[3:15:42] Unexpected exception

Error Log: