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java.lang.NullPointerException at org.bukkit.craftbukkit.inventory.CraftInventory.getItem(CraftInventory.java:30) at org.bukkit.craftbukkit.inventory.CraftInventoryPlayer.getHelmet(CraftInventoryPlayer.java:33) at net.citizensnpcs.traders.TraderTask.clonePlayerInventory(TraderTask.java:331) at net.citizensnpcs.traders.TraderTask.<init>(TraderTask.java:44) at net.citizensnpcs.traders.Trader.onRightClick(Trader.java:157) at net.citizensnpcs.resources.npclib.HumanNPC.callRightClick(HumanNPC.java:73) at net.citizensnpcs.listeners.EntityListen.onEntityTarget(EntityListen.java:114) at org.bukkit.plugin.java.JavaPluginLoader$71.execute(JavaPluginLoader.java:766) at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:57) at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:327) at net.citizensnpcs.listeners.PlayerListen.onPlayerInteractEntity(PlayerListen.java:84) at org.bukkit.plugin.java.JavaPluginLoader$12.execute(JavaPluginLoader.java:349) at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:57) at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:327) at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:923) at net.minecraft.server.Packet7UseEntity.handle(SourceFile:33) at net.minecraft.server.NetworkManager.b(NetworkManager.java:226) at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:100) at net.minecraft.server.NetworkListenThread.a(SourceFile:108) at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:536) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:434) at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)