java.lang.NullPointerException

[lovego123]

java.lang.NullPointerException
at com.dianping.cat.consumer.state.model.transform.BaseVisitor.visitStateReport(BaseVisitor.java:39)
at com.dianping.cat.report.task.DefaultRemoteServersUpdater.buildServers(DefaultRemoteServersUpdater.java:53)
at com.dianping.cat.report.server.ServersUpdaterManager$1.handle(ServersUpdaterManager.java:57)
at com.dianping.cat.task.TimerSyncTask$1.run(TimerSyncTask.java:82)
at java.util.concurrent.Executors$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$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
at org.unidal.helper.Threads$RunnableThread.run(Threads.java:294)