NPE at at org.opendaylight.netvirt.aclservice.utils.AclServiceUtils.getElanIdFromInterface

2017-04-07 03:51:25,897 | ERROR | eChangeHandler-1 | AsyncDataTreeChangeListenerBase | 298 - org.opendaylight.genius.mdsalutil-api - 0.2.0.SNAPSHOT | Thread terminated due to uncaught exception: AsyncDataTreeChangeListenerBase-DataTreeChangeHandler-1
java.lang.NullPointerException
at org.opendaylight.netvirt.aclservice.utils.AclServiceUtils.getElanIdFromInterface(AclServiceUtils.java:670)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.aclservice.AbstractIngressAclServiceImpl.bindService(AbstractIngressAclServiceImpl.java:95)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.aclservice.AbstractAclServiceImpl.bindAcl(AbstractAclServiceImpl.java:107)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.aclservice.AclServiceManagerImpl.notify(AclServiceManagerImpl.java:63)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.aclservice.listeners.AclInterfaceListener.add(AclInterfaceListener.java:133)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.aclservice.listeners.AclInterfaceListener.add(AclInterfaceListener.java:33)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.genius.datastoreutils.AsyncDataTreeChangeListenerBase$DataTreeChangeHandler.run(AsyncDataTreeChangeListenerBase.java:155)[298:org.opendaylight.genius.mdsalutil-api:0.2.0.SNAPSHOT]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_121]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_121]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_121]