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java.lang.NullPointerException: 	at com.dianping.cat.report.page.event.transform.AllMachineMerger.visitEventReport(AllMachineMerger.java:30)	at com.dianping.cat.report.page.event.transform.EventMergeHelper.mergeAllIps(EventMergeHelper.java:12)	at com.dianping.cat.report.page.event.Handler.handleOutbound(Handler.java:203)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.unidal.lookup.util.ReflectUtils.invokeMethod(ReflectUtils.java:49)	at org.unidal.web.mvc.lifecycle.DefaultOutboundActionHandler.handle(DefaultOutboundActionHandler.java:29)	at org.unidal.web.mvc.lifecycle.DefaultRequestLifecycle.handleOutboundAction(DefaultRequestLifecycle.java:111)	at org.unidal.web.mvc.lifecycle.DefaultRequestLifecycle.handleRequest(DefaultRequestLifecycle.java:186)	at org.unidal.web.mvc.lifecycle.DefaultRequestLifecycle.handle(DefaultRequestLifecycle.java:63)	at org.unidal.web.MVC.service(MVC.java:90)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at com.dianping.cat.report.view.DomainFilter.doFilter(DomainFilter.java:83)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at com.dianping.cat.servlet.CatFilter$Context.handle(CatFilter.java:404)	at com.dianping.cat.servlet.CatFilter$CatHandler$3.handle(CatFilter.java:219)	at com.dianping.cat.servlet.CatFilter$Context.handle(CatFilter.java:402)	at com.dianping.cat.servlet.CatFilter$CatHandler$4.handle(CatFilter.java:314)	at com.dianping.cat.servlet.CatFilter$Context.handle(CatFilter.java:402)	at com.dianping.cat.servlet.CatFilter$CatHandler$2.handle(CatFilter.java:202)	at com.dianping.cat.servlet.CatFilter$Context.handle(CatFilter.java:402)	at com.dianping.cat.servlet.CatFilter$CatHandler$1.handle(CatFilter.java:110)	at com.dianping.cat.servlet.CatFilter$Context.handle(CatFilter.java:402)	at com.dianping.cat.servlet.CatFilter.doFilter(CatFilter.java:48)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:745)