null pointer exception in SecurityServicesImpl.syncFixedSecurityGroup

with openstack CI, the following null pointer exception occurs.
getDhcpServerPort() can return null

2016-11-08 09:19:17,013 | ERROR | ntDispatcherImpl | EventDispatcher | 336 - org.opendaylight.netvirt.openstack.net-virt - 1.4.0.SNAPSHOT | Exception in dispatching event NorthboundEvent [handler=
NEUTRON_PORT, action=UPDATE, port=NeutronPort [portUUID=7b5ef356-7384-466b-9fd0-36366bdfd9eb, networkUUID=f1c4b809-62e3-45bc-8eec-df5ef15cb017, name=, adminStateUp=true, status=null, macAddress=fa:16:3e:be:eb:b4,
fixedIPs=[Neutron_IPs

{ipAddress='10.1.0.21', subnetUUID='e4b5081c-b081-47c4-af47-f5b6bb28a2de'}], deviceID=613810e5-cb2b-4c19-b7e1-f8ead6cd303b, deviceOwner=compute:None, tenantID=7cdf7d5664f143eab4ea7f3a127ff704,
securityGroups=[], bindinghostID=ubuntu-xenial-osic-cloud1-s3500-5245939, bindingvnicType=normal, bindingvnicType=normal, portSecurityEnabled=false], subnet=null, router=null, routerInterface=null, floatingIP=nul
l, network=null, loadBalancer=null, loadBalancerPool=null, loadBalancerPoolMember=null, neutronsecurityRule=null]
java.lang.NullPointerException
at org.opendaylight.netvirt.openstack.netvirt.impl.SecurityServicesImpl.syncFixedSecurityGroup(SecurityServicesImpl.java:462)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.impl.NeutronL3Adapter.processPortSecurityEnableUpdated(NeutronL3Adapter.java:936)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.impl.NeutronL3Adapter.handleNeutronPortEvent(NeutronL3Adapter.java:440)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.PortHandler.doNeutronPortUpdated(PortHandler.java:126)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.PortHandler.processEvent(PortHandler.java:208)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.impl.EventDispatcherImpl.dispatchEvent(EventDispatcherImpl.java:96)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.impl.EventDispatcherImpl.lambda$start$0(EventDispatcherImpl.java:58)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[:1.8.0_91]
at java.util.concurrent.FutureTask.run(FutureTask.java:266)[:1.8.0_91]
2016-11-08 09:19:17,013 | ERROR | ntDispatcherImpl | EventDispatcher | 336 - org.opendaylight.netvirt.openstack.net-virt - 1.4.0.SNAPSHOT | Exception in dispatching event NorthboundEvent [handler=
NEUTRON_PORT, action=UPDATE, port=NeutronPort [portUUID=7b5ef356-7384-466b-9fd0-36366bdfd9eb, networkUUID=f1c4b809-62e3-45bc-8eec-df5ef15cb017, name=, adminStateUp=true, status=null, macAddress=fa:16:3e:be:eb:b4,
fixedIPs=[Neutron_IPs{ipAddress='10.1.0.21', subnetUUID='e4b5081c-b081-47c4-af47-f5b6bb28a2de'}

], deviceID=613810e5-cb2b-4c19-b7e1-f8ead6cd303b, deviceOwner=compute:None, tenantID=7cdf7d5664f143eab4ea7f3a127ff704,
securityGroups=[], bindinghostID=ubuntu-xenial-osic-cloud1-s3500-5245939, bindingvnicType=normal, bindingvnicType=normal, portSecurityEnabled=false], subnet=null, router=null, routerInterface=null, floatingIP=nul
l, network=null, loadBalancer=null, loadBalancerPool=null, loadBalancerPoolMember=null, neutronsecurityRule=null]
java.lang.NullPointerException
at org.opendaylight.netvirt.openstack.netvirt.impl.SecurityServicesImpl.syncFixedSecurityGroup(SecurityServicesImpl.java:462)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.impl.NeutronL3Adapter.processPortSecurityEnableUpdated(NeutronL3Adapter.java:936)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.impl.NeutronL3Adapter.handleNeutronPortEvent(NeutronL3Adapter.java:440)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.PortHandler.doNeutronPortUpdated(PortHandler.java:126)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.PortHandler.processEvent(PortHandler.java:208)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.impl.EventDispatcherImpl.dispatchEvent(EventDispatcherImpl.java:96)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at org.opendaylight.netvirt.openstack.netvirt.impl.EventDispatcherImpl.lambda$start$0(EventDispatcherImpl.java:58)[336:org.opendaylight.netvirt.openstack.net-virt:1.4.0.SNAPSHOT]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[:1.8.0_91]
at java.util.concurrent.FutureTask.run(FutureTask.java:266)[:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_91]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_91]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_91]