NullPointerException in FlowComparator.matchEquals

2014-07-16 12:14:02.505 PDT [md-sal-binding-notification-77] ERROR o.o.c.sal.binding.impl.NotifyTask - Unhandled exception thrown by listener: org.opendaylight.controller.md.statistics.manager.StatisticsListener$$Broker$ListenerInvoker@48813cc5
java.lang.NullPointerException: null
at org.opendaylight.controller.md.statistics.manager.FlowComparator.matchEquals(FlowComparator.java:98) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.FlowComparator.flowEquals(FlowComparator.java:50) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.FlowStatsTracker.updateSingleStat(FlowStatsTracker.java:141) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.FlowStatsTracker.updateSingleStat(FlowStatsTracker.java:38) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.AbstractStatsTracker.updateStats(AbstractStatsTracker.java:107) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.NodeStatisticsHandler.updateFlowStats(NodeStatisticsHandler.java:216) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.StatisticsListener.onFlowsStatisticsUpdate(StatisticsListener.java:109) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.StatisticsListener$$Broker$ListenerInvoker.onNotification(StatisticsListener$$Broker$ListenerInvoker.java) ~[na:na]
at org.opendaylight.controller.sal.binding.impl.AbstractNotificationListenerRegistration.notify(AbstractNotificationListenerRegistration.java:38) ~[na:na]
at org.opendaylight.controller.sal.binding.impl.NotifyTask.run(NotifyTask.java:42) ~[na:na]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [na:1.7.0_55]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_55]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_55]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_55]
at java.lang.Thread.run(Thread.java:744) [na:1.7.0_55]