java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at cpw.mods.fml.common.network.FMLOutboundHandler$OutboundTarget$4.selectNetworks(FMLOutboundHandler.java:109)
at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:637)
at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:115)
at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)
at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698)
at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:688)
at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:717)
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:893)
at cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper.sendTo(SimpleNetworkWrapper.java:196)
at Reika.DragonAPI.Instantiable.IO.PacketPipeline.sendToPlayer(PacketPipeline.java:83)
at Reika.DragonAPI.Libraries.IO.ReikaPacketHelper.sendDataPacket(ReikaPacketHelper.java:250)
at Reika.DragonAPI.Libraries.IO.ReikaPacketHelper.sendDataPacket(ReikaPacketHelper.java:210)
at Reika.DragonAPI.Extras.LoginHandler.onPlayerLogout(LoginHandler.java:88)
at Reika.DragonAPI.Auxiliary.Trackers.PlayerHandler.onLogin(PlayerHandler.java:43)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_512_PlayerHandler_onLogin_PlayerLoggedOutEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraft.network.NetHandlerPlayServer.func_147231_a(NetHandlerPlayServer.java:633)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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