[16:28:05 INFO]: flatbmx issued server command: /ex listen itemdrop type:mobkill region:mob-arena droprate:100 item:sapphire qty:1 dropsfrom:zombie
[16:28:05 INFO]:  Starting InstantQueue 'ENNNZNEZEE'...
[16:28:05 INFO]: +- Executing dCommand: LISTEN/flatbmx ---------+
[16:28:05 INFO]: +> Executing 'LISTEN': action='new'  type='itemdrop'
                   id='6167dc5b-b060-4588-84a0-e757c34fdfc6'
[16:28:05 INFO]:  Cancelled creation of NEW listener!
[16:28:05 WARN]: java.lang.NullPointerException
[16:28:05 WARN]:        at net.aufdemrand.denizen.listeners.AbstractListener.save(AbstractListener.java:158)
[16:28:05 WARN]:        at net.aufdemrand.denizen.listeners.AbstractListener.build(AbstractListener.java:46)
[16:28:05 WARN]:        at net.aufdemrand.denizen.scripts.commands.player.ListenCommand.execute(ListenCommand.java:101)
[16:28:05 WARN]:        at net.aufdemrand.denizen.scripts.commands.CommandExecuter.execute(CommandExecuter.java:190)
[16:28:05 WARN]:        at net.aufdemrand.denizen.scripts.queues.ScriptEngine.revolve(ScriptEngine.java:48)
[16:28:05 WARN]:        at net.aufdemrand.denizen.scripts.queues.ScriptQueue.revolve(ScriptQueue.java:555)
[16:28:05 WARN]:        at net.aufdemrand.denizen.scripts.queues.core.InstantQueue.onStart(InstantQueue.java:54)
[16:28:05 WARN]:        at net.aufdemrand.denizen.scripts.queues.ScriptQueue.start(ScriptQueue.java:439)
[16:28:05 WARN]:        at net.aufdemrand.denizen.Denizen.onCommand(Denizen.java:498)
[16:28:05 WARN]:        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
[16:28:05 WARN]:        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:175)
[16:28:05 WARN]:        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServer.java:706)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.PlayerConnection.handleCommand(PlayerConnection.java:984)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:829)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.PacketPlayInChat.a(PacketPlayInChat.java:28)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.PacketPlayInChat.handle(PacketPlayInChat.java:65)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:147)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.ServerConnection.c(ServerConnection.java:77)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:700)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:273)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:562)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:469)
[16:28:05 WARN]:        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)
[16:28:05 INFO]:  Completing queue 'ENNNZNEZEE'.