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java.lang.NullPointerException: null	at io.netty.handler.codec.http2.DefaultHttp2Connection.close(DefaultHttp2Connection.java:140)	at io.netty.handler.codec.http2.Http2ConnectionHandler$BaseDecoder.channelInactive(Http2ConnectionHandler.java:179)	at io.netty.handler.codec.http2.Http2ConnectionHandler.channelInactive(Http2ConnectionHandler.java:370)	at io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelInactiveNow(ChannelHandlerInvokerUtil.java:56)	at io.netty.channel.DefaultChannelHandlerInvoker.invokeChannelInactive(DefaultChannelHandlerInvoker.java:93)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:342)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:124)	at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75)	at io.netty.handler.timeout.IdleStateHandler.channelInactive(IdleStateHandler.java:257)	at io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelInactiveNow(ChannelHandlerInvokerUtil.java:56)	at io.netty.channel.DefaultChannelHandlerInvoker.invokeChannelInactive(DefaultChannelHandlerInvoker.java:93)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:342)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:124)	at io.netty.handler.codec.ByteToMessageDecoder.channelInputClosed(ByteToMessageDecoder.java:349)	at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:309)	at io.netty.handler.ssl.SslHandler.channelInactive(SslHandler.java:727)	at io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelInactiveNow(ChannelHandlerInvokerUtil.java:56)	at io.netty.channel.DefaultChannelHandlerInvoker.invokeChannelInactive(DefaultChannelHandlerInvoker.java:93)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:342)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:124)	at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:1060)	at io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:747)	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:339)	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:373)	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:742)	at java.lang.Thread.run(Thread.java:745)