Bukkit

I got this message while looking at the console. No idea what the player did to get it.

15:38:41 [GRAVE] [Skybank] An exception occured. Please notify the plugin developpers via a BukkitDev ticket.
15:38:41 [GRAVE] [Skybank] Exception details: null
15:38:41 [GRAVE] [Skybank] java.lang.NullPointerException
    at Neptuner.Bank.SlotLoader.saveSlot(SlotLoader.java:161)
    at Neptuner.Bank.BankBlockListener.onQuit(BankBlockListener.java:112)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:330)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
    at net.minecraft.server.ServerConfigurationManagerAbstract.disconnect(ServerConfigurationManagerAbstract.java:206)
    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:711)
    at fr.neatmonster.nocheatplus.NetServerHandlerProxy.a(NetServerHandlerProxy.java:525)
    at net.minecraft.server.NetworkManager.b(NetworkManager.java:281)
    at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
    at fr.neatmonster.nocheatplus.NetServerHandlerProxy.d(NetServerHandlerProxy.java:549)
    at net.minecraft.server.ServerConnection.b(SourceFile:35)
    at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:581)
    at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
    at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)

Known issue. We're working on it!

@lemon42: Go

Thanks for the quick reply, I'll be waiting! =)