Clustering : StatisticsManager throws NPE when running single node integration tests

2014-10-31 11:29:44,687 | ERROR | -notification-21 | NotifyTask | 140 - org.opendaylight.controller.sal-binding-broker-impl - 1.2.0.SNAPSHOT | Unhandled exception thrown by listener: org.opendaylight.controller.md.statistics.manager.impl.StatListenCommitFlow$$Broker$ListenerInvoker@5d22f281
java.lang.NullPointerException
at org.opendaylight.controller.md.statistics.manager.impl.StatAbstractNotifyCommit.isExpectedStatistics(StatAbstractNotifyCommit.java:125)[151:org.opendaylight.controller.md.statistics-manager:1.2.0.SNAPSHOT]
at
This exception happens many many times during the test and may be the root cause for why some data appears to be missing in the datastore.

org.opendaylight.controller.md.statistics.manager.impl.StatListenCommitFlow.onFlowsStatisticsUpdate(StatListenCommitFlow.java:172)[151:org.opendaylight.controller.md.statistics-manager:1.2.0.SNAPSHOT]
at org.opendaylight.controller.md.statistics.manager.impl.StatListenCommitFlow$$Broker$ListenerInvoker.onNotification(StatListenCommitFlow$$Broker$ListenerInvoker.java)[151:org.opendaylight.controller.md.statistics-manager:1.2.0.SNAPSHOT]
at org.opendaylight.controller.sal.binding.impl.AbstractNotificationListenerRegistration.notify(AbstractNotificationListenerRegistration.java:38)[140:org.opendaylight.controller.sal-binding-broker-impl:1.2.0.SNAPSHOT]
at org.opendaylight.controller.sal.binding.impl.NotifyTask.run(NotifyTask.java:42)[140:org.opendaylight.controller.sal-binding-broker-impl:1.2.0.SNAPSHOT]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)[:1.7.0_65]
at java.util.concurrent.FutureTask.run(FutureTask.java:262)[:1.7.0_65]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[:1.7.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[:1.7.0_65]
at java.lang.Thread.run(Thread.java:745)[:1.7.0_65]