NullPointerException during node shutdown #279

org.ros.exception.RosRuntimeException: java.lang.NullPointerException
	at org.ros.address.AdvertiseAddress.toString(AdvertiseAddress.java:123)
	at java.lang.String.valueOf(String.java:2994)
	at java.lang.StringBuilder.append(StringBuilder.java:131)
	at org.ros.address.AdvertiseAddress.toUri(AdvertiseAddress.java:109)
	at org.ros.internal.node.service.DefaultServiceServer.getUri(DefaultServiceServer.java:117)
	at org.ros.internal.node.client.MasterClient.unregisterService(MasterClient.java:91)
	at org.ros.internal.node.DefaultNode.shutdown(DefaultNode.java:424)
        ...
        at org.ros.internal.transport.queue.MessageDispatcher$1.run(MessageDispatcher.java:125)
	at org.ros.internal.transport.queue.MessageDispatcher$1.run(MessageDispatcher.java:122)
	at org.ros.concurrent.EventDispatcher.loop(EventDispatcher.java:43)
	at org.ros.concurrent.CancellableLoop.run(CancellableLoop.java:56)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
	at org.ros.internal.transport.tcp.TcpRosServer$1.call(TcpRosServer.java:91)
	at org.ros.internal.transport.tcp.TcpRosServer$1.call(TcpRosServer.java:88)
	at org.ros.address.AdvertiseAddress.toString(AdvertiseAddress.java:121)
	... 17 more