ProActive Scheduler

[junit] RunningTasks list was null, This is an abnormal case
   [junit] java.lang.ArithmeticException: / by zero
   [junit] java.lang.ArithmeticException: / by zero
   [junit] at org.ow2.proactive.scheduler.common.jmx.mbean.SchedulerWrapperAdmin.calculateMean(SchedulerWrapperAdmin.java:454)
   [junit] at org.ow2.proactive.scheduler.common.jmx.mbean.SchedulerWrapperAdmin.jobRunningToFinishedEvent(SchedulerWrapperAdmin.java:277)
   [junit] at org.ow2.proactive.scheduler.common.jmx.mbean.SchedulerWrapperAdmin.jobStateUpdatedEvent(SchedulerWrapperAdmin.java:204)
   [junit] at org.ow2.proactive.scheduler.core.jmx.JMXMonitoringHelper.jobStateUpdatedEvent(JMXMonitoringHelper.java:134)
   [junit] at org.ow2.proactive.scheduler.core.SchedulerFrontend.jobStateUpdated(SchedulerFrontend.java:1159)
   [junit] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   [junit] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   [junit] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   [junit] at java.lang.reflect.Method.invoke(Method.java:597)
   [junit] at org.objectweb.proactive.core.mop.MethodCall.execute(MethodCall.java:395)
   [junit] at org.objectweb.proactive.core.body.request.RequestImpl.serveInternal(RequestImpl.java:230)
   [junit] at org.objectweb.proactive.core.body.request.RequestImpl.serve(RequestImpl.java:174)
   [junit] at org.objectweb.proactive.core.body.BodyImpl$ActiveLocalBodyStrategy.serveInternal(BodyImpl.java:562)
   [junit] at org.objectweb.proactive.core.body.BodyImpl$ActiveLocalBodyStrategy.serve(BodyImpl.java:525)
   [junit] at org.objectweb.proactive.core.body.AbstractBody.serve(AbstractBody.java:922)
   [junit] at org.objectweb.proactive.Service.blockingServeOldest(Service.java:175)
   [junit] at org.objectweb.proactive.Service.blockingServeOldest(Service.java:150)
   [junit] at org.objectweb.proactive.Service.fifoServing(Service.java:126)
   [junit] at org.objectweb.proactive.core.body.ActiveBody$FIFORunActive.runActivity(ActiveBody.java:317)
   [junit] at org.objectweb.proactive.core.body.ActiveBody.run(ActiveBody.java:197)
   [junit] at java.lang.Thread.run(Thread.java:619)