NPE in OFRpcTaskUtil$1.onSuccess(OFRpcTaskUtil.java:129)

Observed NPE

2014-09-24 11:44:53,469 | ERROR | OFRpc-2 | ExecutionList | 78 - com.google.guava - 14.0.1 | RuntimeException while executing runnable com.google.common.util.concurrent.Futures$4@470cc888 with executor com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService@18417d29
java.lang.NullPointerException
at org.opendaylight.openflowplugin.openflow.md.core.sal.OFRpcTaskUtil$1.onSuccess(OFRpcTaskUtil.java:129)[212:org.opendaylight.openflowplugin:0.0.3.SNAPSHOT]
at org.opendaylight.openflowplugin.openflow.md.core.sal.OFRpcTaskUtil$1.onSuccess(OFRpcTaskUtil.java:125)[212:org.opendaylight.openflowplugin:0.0.3.SNAPSHOT]
at com.google.common.util.concurrent.Futures$4.run(Futures.java:1149)[78:com.google.guava:14.0.1]
at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293)[78:com.google.guava:14.0.1]
at com.google.common.util.concurrent.ExecutionList$RunnableExecutorPair.execute(ExecutionList.java:150)[78:com.google.guava:14.0.1]
at com.google.common.util.concurrent.ExecutionList.add(ExecutionList.java:106)[78:com.google.guava:14.0.1]
at com.google.common.util.concurrent.AbstractFuture.addListener(AbstractFuture.java:170)[78:com.google.guava:14.0.1]
at com.google.common.util.concurrent.Futures.addCallback(Futures.java:1152)[78:com.google.guava:14.0.1]
at com.google.common.util.concurrent.Futures.addCallback(Futures.java:1088)[78:com.google.guava:14.0.1]
at org.opendaylight.openflowplugin.openflow.md.core.sal.OFRpcTaskUtil.hookFutureNotification(OFRpcTaskUtil.java:125)[212:org.opendaylight.openflowplugin:0.0.3.SNAPSHOT]
at org.opendaylight.openflowplugin.openflow.md.core.sal.OFRpcTaskFactory$1.call(OFRpcTaskFactory.java:204)[212:org.opendaylight.openflowplugin:0.0.3.SNAPSHOT]
at org.opendaylight.openflowplugin.openflow.md.core.sal.OFRpcTaskFactory$1.call(OFRpcTaskFactory.java:188)[212:org.opendaylight.openflowplugin:0.0.3.SNAPSHOT]
at java.util.concurrent.FutureTask.run(FutureTask.java:262)[:1.7.0_65]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[:1.7.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[:1.7.0_65]
at java.lang.Thread.run(Thread.java:745)[:1.7.0_65]