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java.lang.NullPointerException: null	at edu.uchicago.monitor.MonitorChannelHandler.handleResponse(	at edu.uchicago.monitor.MonitorChannelHandler.write(	at	at	at	at io.netty.handler.timeout.IdleStateHandler.write(	at	at	at	at	at	at	at	at	at org.dcache.xrootd.core.XrootdRequestHandler.respond(	at org.dcache.xrootd.core.XrootdRequestHandler.requestReceived(	at org.dcache.xrootd.core.XrootdRequestHandler.channelRead(	at	at	at	at	at	at io.netty.handler.timeout.IdleStateHandler.channelRead(	at	at	at edu.uchicago.monitor.MonitorChannelHandler.channelRead(	at	at	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(	at	at	at	at	at	at	at$	at	at	at	at	at io.netty.util.concurrent.SingleThreadEventExecutor$	at org.dcache.util.CDCThreadFactory$	at