2014-12-21 10:20:08 [WARNING] [IslandWorld] Task #90 for IslandWorld v4.7 generated an exception
java.lang.NullPointerException
	at exnihilo.blocks.tileentities.TileEntityBarrel.func_70299_a(TileEntityBarrel.java:1020)
	at org.bukkit.craftbukkit.v1_6_R3.inventory.CraftInventory.setItem(CraftInventory.java:78)
	at org.bukkit.craftbukkit.v1_6_R3.inventory.CraftInventory.clear(CraftInventory.java:395)
	at org.bukkit.craftbukkit.v1_6_R3.inventory.CraftInventory.clear(CraftInventory.java:400)
	at pl.islandworld.IslandWorld$deleteLayer.run(IslandWorld.java:1399)
	at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftTask.run(CraftTask.java:58)
	at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:822)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:777)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:659)
	at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)