vpnmanager-impl: failed to handle dcn: java.lang.NullPointerException

2016-08-29 08:13:31,637 | TRACE | on-dispatcher-52 | InterfaceStateChangeListener | 349 - org.opendaylight.netvirt.vpnmanager-impl - 0.4.0.SNAPSHOT | Operation Interface update event - Old: Interface{getAdminStatus=Up, getLowerLayerIf=[openflow:207558349382376:1], getName=tapf478fd89-8c, getOperStatus=Up, getPhysAddress=PhysAddress [_value=f2:ae:5d:e8:c0:70], augmentations={}}, New: Interface{getAdminStatus=Up, getLowerLayerIf=[openflow:207558349382376:1], getName=tapf478fd89-8c, getOperStatus=Up, getPhysAddress=PhysAddress [_value=f4:00:00:0f:00:01], augmentations={}}
2016-08-29 08:13:31,638 | TRACE | on-dispatcher-52 | AbstractDataChangeListener | 349 - org.opendaylight.netvirt.vpnmanager-impl - 0.4.0.SNAPSHOT | failed to handle dcn
java.lang.NullPointerException
at org.opendaylight.netvirt.vpnmanager.InterfaceStateChangeListener.update(InterfaceStateChangeListener.java:200)[349:org.opendaylight.netvirt.vpnmanager-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.vpnmanager.InterfaceStateChangeListener.update(InterfaceStateChangeListener.java:42)[349:org.opendaylight.netvirt.vpnmanager-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.vpnmanager.AbstractDataChangeListener.updateData(AbstractDataChangeListener.java:97)[349:org.opendaylight.netvirt.vpnmanager-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.vpnmanager.AbstractDataChangeListener.onDataChanged(AbstractDataChangeListener.java:60)[349:org.opendaylight.netvirt.vpnmanager-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.md.sal.binding.impl.AbstractForwardedDataBroker$TranslatingDataChangeInvoker.onDataChanged(AbstractForwardedDataBroker.java:143)[187:org.opendaylight.controller.sal-binding-broker-impl:1.5.0.SNAPSHOT]
at org.opendaylight.controller.cluster.datastore.DataChangeListener.dataChanged(DataChangeListener.java:71)[217:org.opendaylight.controller.sal-distributed-datastore:1.5.0.SNAPSHOT]
at org.opendaylight.controller.cluster.datastore.DataChangeListener.handleReceive(DataChangeListener.java:43)[217:org.opendaylight.controller.sal-distributed-datastore:1.5.0.SNAPSHOT]
at org.opendaylight.controller.cluster.common.actor.AbstractUntypedActor.onReceive(AbstractUntypedActor.java:26)[211:org.opendaylight.controller.sal-clustering-commons:1.5.0.SNAPSHOT]
at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)[199:com.typesafe.akka.actor:2.4.7]
at akka.actor.Actor$class.aroundReceive(Actor.scala:484)[199:com.typesafe.akka.actor:2.4.7]
at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)[199:com.typesafe.akka.actor:2.4.7]
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)[199:com.typesafe.akka.actor:2.4.7]
at akka.actor.ActorCell.invoke(ActorCell.scala:495)[199:com.typesafe.akka.actor:2.4.7]
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)[199:com.typesafe.akka.actor:2.4.7]
at akka.dispatch.Mailbox.run(Mailbox.scala:224)[199:com.typesafe.akka.actor:2.4.7]
at akka.dispatch.Mailbox.exec(Mailbox.scala:234)[199:com.typesafe.akka.actor:2.4.7]
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)[195:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)[195:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)[195:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)[195:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]