一直在写如下日志，每天产生60G消息，请问这是什么问题
java.lang.NullPointerException: null
at org.apache.rocketmq.mqtt.common.util.TopicUtils.decode(TopicUtils.java:116)
at org.apache.rocketmq.mqtt.cs.session.match.MatchAction.matchClients(MatchAction.java:54)
at org.apache.rocketmq.mqtt.cs.session.notify.MessageNotifyAction.notify(MessageNotifyAction.java:60)
at org.apache.rocketmq.mqtt.cs.protocol.rpc.RpcPacketDispatcher.doNotify(RpcPacketDispatcher.java:75)
at org.apache.rocketmq.mqtt.cs.protocol.rpc.RpcPacketDispatcher.processRequest(RpcPacketDispatcher.java:56)
at org.apache.rocketmq.remoting.netty.NettyRemotingAbstract$1.run(NettyRemotingAbstract.java:229)
at org.apache.rocketmq.remoting.netty.RequestTask.run(RequestTask.java:80)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)