If 2 flows with layer3 match are added to switch and one of the do not contain destination or source address, cmoparison will fail on NPE.

2014-02-07 14:33:52.859 CET [md-sal-binding-notification-6] ERROR o.o.c.sal.binding.impl.NotifyTask - Unhandled exception thrown by listener: org.openday
java.lang.NullPointerException: null
at org.opendaylight.controller.md.statistics.manager.StatisticsUpdateCommiter.IpAddressEquals(StatisticsUpdateCommiter.java:892) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.StatisticsUpdateCommiter.layer3MatchEquals(StatisticsUpdateCommiter.java:874) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.StatisticsUpdateCommiter.matchEquals(StatisticsUpdateCommiter.java:823) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.StatisticsUpdateCommiter.flowEquals(StatisticsUpdateCommiter.java:725) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.StatisticsUpdateCommiter.onFlowsStatisticsUpdate(StatisticsUpdateCommiter.java:457) ~[na:na]
at org.opendaylight.controller.md.statistics.manager.StatisticsUpdateCommiter$$Broker$ListenerInvoker.onNotification(StatisticsUpdateCommiter$$Br
at org.opendaylight.controller.sal.binding.impl.NotifyTask.call(NotifyTask.java:59) ~[na:na]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) ~[na:1.7.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:166) ~[na:1.7.0_25]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[na:1.7.0_25]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) ~[na:1.7.0_25]
at java.lang.Thread.run(Thread.java:724) ~[na:1.7.0_25]