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

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This exception has no message.
java.lang.NullPointerException:
at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011)
at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1006)
at protocolsupport.protocol.storage.ProtocolStorage.setProtocolVersion(ProtocolStorage.java:13)
at protocolsupport.protocol.pipeline.initial.InitialPacketDecoder.setProtocol(InitialPacketDecoder.java:156)
at protocolsupport.protocol.pipeline.initial.InitialPacketDecoder.decode(InitialPacketDecoder.java:145)
at protocolsupport.protocol.pipeline.initial.InitialPacketDecoder.channelRead0(InitialPacketDecoder.java:97)
at protocolsupport.protocol.pipeline.initial.InitialPacketDecoder.channelRead0(InitialPacketDecoder.java:27)
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
at protocolsupport.protocol.pipeline.timeout.SimpleReadTimeoutHandler.channelRead(SimpleReadTimeoutHandler.java:39)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787)
at io.netty.channel.epoll.EpollSocketChannel$EpollSocketUnsafe.epollInReady(EpollSocketChannel.java:722)
at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:326)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:264)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
at java.lang.Thread.run(Thread.java:745)

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