NPE in JGroupsTransport.send(..) when stopping

2018-03-16 15:52:30,614 INFO  [org.infinispan.CLUSTER] (remote-thread--p31-t2) [Context=client-mappings][Scope=node-2]ISPN100003: Node node-2 finished rebalance phase with topology id 33
2018-03-16 15:52:30,614 WARN  [org.infinispan.topology.CacheTopologyControlCommand] (remote-thread--p33-t7) ISPN000071: Caught exception when handling command CacheTopologyControlCommand{cache=clusterbench-ee7.ear.clusterbench-ee7-web-granular.war, type=REBALANCE_PHASE_CONFIRM, sender=node-3, joinInfo=null, topologyId=43, rebalanceId=0, currentCH=null, pendingCH=null, availabilityMode=null, phase=null, actualMembers=null, throwable=null, viewId=8}: org.infinispan.commons.CacheException: Failed to broadcast asynchronous command: CacheTopologyControlCommand{cache=clusterbench-ee7.ear.clusterbench-ee7-web-granular.war, type=CH_UPDATE, sender=node-1, joinInfo=null, topologyId=44, rebalanceId=13, currentCH=DefaultConsistentHash{ns=256, owners = (2)[node-2: 124+132, node-3: 132+124]}, pendingCH=null, availabilityMode=null, phase=NO_REBALANCE, actualMembers=[node-2, node-3], throwable=null, viewId=8}
	at org.infinispan.topology.ClusterTopologyManagerImpl.executeOnClusterAsync(ClusterTopologyManagerImpl.java:638)
	at org.infinispan.topology.ClusterTopologyManagerImpl.broadcastTopologyUpdate(ClusterTopologyManagerImpl.java:649)
	at org.infinispan.topology.ClusterCacheStatus.endReadNewPhase(ClusterCacheStatus.java:452)
	at org.infinispan.topology.RebalanceConfirmationCollector.confirmPhase(RebalanceConfirmationCollector.java:55)
	at org.infinispan.topology.ClusterCacheStatus.confirmRebalancePhase(ClusterCacheStatus.java:337)
	at org.infinispan.topology.ClusterTopologyManagerImpl.handleRebalancePhaseConfirm(ClusterTopologyManagerImpl.java:258)
	at org.infinispan.topology.CacheTopologyControlCommand.doPerform(CacheTopologyControlCommand.java:183)
	at org.infinispan.topology.CacheTopologyControlCommand.invokeAsync(CacheTopologyControlCommand.java:160)
	at org.infinispan.remoting.inboundhandler.GlobalInboundInvocationHandler.invokeReplicableCommand(GlobalInboundInvocationHandler.java:169)
	at org.infinispan.remoting.inboundhandler.GlobalInboundInvocationHandler.runReplicableCommand(GlobalInboundInvocationHandler.java:150)
	at org.infinispan.remoting.inboundhandler.GlobalInboundInvocationHandler.lambda$handleReplicableCommand$1(GlobalInboundInvocationHandler.java:144)
	at org.infinispan.util.concurrent.BlockingTaskAwareExecutorServiceImpl$RunnableWrapper.run(BlockingTaskAwareExecutorServiceImpl.java:212)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.wildfly.clustering.service.concurrent.ClassLoaderThreadFactory.lambda$newThread$0(ClassLoaderThreadFactory.java:47)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
	at org.infinispan.remoting.transport.jgroups.JGroupsTransport.send(JGroupsTransport.java:976)
	at org.infinispan.remoting.transport.jgroups.JGroupsTransport.sendCommandToAll(JGroupsTransport.java:1096)
	at org.infinispan.remoting.transport.jgroups.JGroupsTransport.performAsyncRemoteInvocation(JGroupsTransport.java:1034)
	at org.infinispan.remoting.transport.jgroups.JGroupsTransport.invokeRemotelyAsync(JGroupsTransport.java:242)
	at org.infinispan.remoting.transport.Transport.invokeRemotely(Transport.java:65)
	at org.infinispan.topology.ClusterTopologyManagerImpl.executeOnClusterAsync(ClusterTopologyManagerImpl.java:635)
	... 15 more

2018-03-16 15:52:30,616 INFO  [org.jboss.as.clustering.infinispan] (ServerService Thread Pool -- 19) WFLYCLINF0003: Stopped client-mappings cache from ejb container