java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at edu.uchicago.monitor.MonitorChannelHandler.handleResponse(MonitorChannelHandler.java:183)
at edu.uchicago.monitor.MonitorChannelHandler.write(MonitorChannelHandler.java:74)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:633)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:691)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:626)
at io.netty.handler.timeout.IdleStateHandler.write(IdleStateHandler.java:266)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:633)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:691)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:626)
at org.dcache.xrootd.stream.ChunkedResponseWriteHandler.write(ChunkedResponseWriteHandler.java:89)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:633)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:691)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:681)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:716)
at org.dcache.xrootd.core.XrootdRequestHandler.respond(XrootdRequestHandler.java:204)
at org.dcache.xrootd.core.XrootdRequestHandler.requestReceived(XrootdRequestHandler.java:175)
at org.dcache.xrootd.core.XrootdRequestHandler.channelRead(XrootdRequestHandler.java:78)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:254)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at edu.uchicago.monitor.MonitorChannelHandler.channelRead(MonitorChannelHandler.java:63)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:244)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
at org.dcache.util.CDCThreadFactory$1.run(CDCThreadFactory.java:53)
at java.lang.Thread.run(Thread.java:745)

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