Longevity He plugin: Null Point Exceptions are seeing at the beginning of the test

When we bring 200 switches up and down we see:

2016-01-16 13:45:37,254 | WARN | ds-oper-thread-0 | StatisticsManagerImpl | 155 - org.opendaylight.openflowplugin.applications.statistics-manager - 0.2.0.SNAPSHOT | Unhandled exception during processing statistics. Restarting transaction chain.
java.lang.NullPointerException
at org.opendaylight.openflowplugin.applications.statistics.manager.impl.StatListenCommitQueue$1.applyOperation(StatListenCommitQueue.java:129)[155:org.opendaylight.openflowplugin.applications.statistics-manager:0.2.0.SNAPSHOT]
at org.opendaylight.openflowplugin.applications.statistics.manager.impl.StatisticsManagerImpl.run(StatisticsManagerImpl.java:186)[155:org.opendaylight.openflowplugin.applications.statistics-manager:0.2.0.SNAPSHOT]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[:1.7.0_85]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[:1.7.0_85]
at java.lang.Thread.run(Thread.java:745)[:1.7.0_85]

Question is: can we fix this or should we remove this check in the longevity test?