NPE at org.opendaylight.netvirt.elan.internal.ElanSmacFlowEventListener.onFlowRemoved

Seen in https://logs.opendaylight.org/releng/jenkins092/netvirt-csit-1node-openstack-newton-nodl-v2-upstream-stateful-carbon/465/archives/odl1_karaf.log.gz

2017-05-02 04:08:56,652 | ERROR | pool-16-thread-1 | DOMNotificationRouterEvent | 144 - org.opendaylight.controller.sal-broker-impl - 1.5.0.SNAPSHOT | Delivery of notification org.opendaylight.controller.md.sal.binding.impl.LazySerializedDOMNotification@1ae1f99e caused an error in listener org.opendaylight.controller.md.sal.binding.impl.BindingDOMNotificationListenerAdapter@8035dc
java.lang.NullPointerException
at org.opendaylight.netvirt.elan.internal.ElanSmacFlowEventListener.onFlowRemoved(ElanSmacFlowEventListener.java:121)[340:org.opendaylight.netvirt.elanmanager-impl:0.4.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.binding.util.NotificationListenerInvoker.invokeNotification(NotificationListenerInvoker.java:117)[47:org.opendaylight.mdsal.yang-binding:0.10.0.SNAPSHOT]
at org.opendaylight.controller.md.sal.binding.impl.BindingDOMNotificationListenerAdapter.onNotification(BindingDOMNotificationListenerAdapter.java:44)[146:org.opendaylight.controller.sal-binding-broker-impl:1.5.0.SNAPSHOT]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMNotificationRouterEvent.deliverNotification(DOMNotificationRouterEvent.java:56)[144:org.opendaylight.controller.sal-broker-impl:1.5.0.SNAPSHOT]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMNotificationRouter$1.onEvent(DOMNotificationRouter.java:68)[144:org.opendaylight.controller.sal-broker-impl:1.5.0.SNAPSHOT]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMNotificationRouter$1.onEvent(DOMNotificationRouter.java:65)[144:org.opendaylight.controller.sal-broker-impl:1.5.0.SNAPSHOT]
at com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:129)[131:com.lmax.disruptor:3.3.6]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_121]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_121]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_121]