03:57:15 [WARNING] Task of 'Citizens' generated an exception
java.lang.NullPointerException
        at net.minecraft.server.ItemStack.a(ItemStack.java:157)
        at net.minecraft.server.InventoryPlayer.a(InventoryPlayer.java:283)
        at net.citizensnpcs.resources.npclib.PathNPC.attackEntity(Unknown Source
)
        at net.citizensnpcs.resources.npclib.PathNPC.updateTarget(Unknown Source
)
        at net.citizensnpcs.resources.npclib.PathNPC.updateMove(Unknown Source)
        at net.citizensnpcs.resources.npclib.HumanNPC.doTick(Unknown Source)
        at net.citizensnpcs.TickTask.run(Unknown Source)
        at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(C
raftScheduler.java:137)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:428)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:363)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)
03:57:20 [INFO] ryanpete [/124.183.181.171:58735] logged in with entity id 70654
 at ([world] 71.5, 65.0, 463.5)
03:58:04 [INFO] Read timed out