NPE in DefaultConsistentHash

15:11:04,782 DEBUG [org.infinispan.topology.LocalTopologyManagerImpl] (OOB-5,shared=udp) Starting local rebalance for cache testCache, topology = CacheTopology{id=3, currentCH=DefaultConsistentHash{numSegments=40, numOwners=2, members=[node04/default]}, pendingCH=null}
15:11:04,782 WARN  [org.infinispan.topology.CacheTopologyControlCommand] (OOB-5,shared=udp) ISPN000071: Caught exception when handling command CacheTopologyControlCommand{cache=testCache, type=REBALANCE_START, sender=node04/default, joinInfo=null, topologyId=3, currentCH=DefaultConsistentHash{numSegments=40, numOwners=2, members=[node04/default]}, pendingCH=null, throwable=null, viewId=4}: java.lang.NullPointerException
	at org.infinispan.distribution.ch.DefaultConsistentHash.union(DefaultConsistentHash.java:243) [infinispan-core-5.2.3.Final-redhat-1.jar:5.2.3.Final-redhat-1]
	at org.infinispan.distribution.ch.DefaultConsistentHashFactory.union(DefaultConsistentHashFactory.java:120) [infinispan-core-5.2.3.Final-redhat-1.jar:5.2.3.Final-redhat-1]
	at org.infinispan.distribution.ch.DefaultConsistentHashFactory.union(DefaultConsistentHashFactory.java:45) [infinispan-core-5.2.3.Final-redhat-1.jar:5.2.3.Final-redhat-1]
	at org.infinispan.topology.LocalTopologyManagerImpl.handleRebalance(LocalTopologyManagerImpl.java:228) [infinispan-core-5.2.3.Final-redhat-1.jar:5.2.3.Final-redhat-1]
	at org.infinispan.topology.CacheTopologyControlCommand.doPerform(CacheTopologyControlCommand.java:168) [infinispan-core-5.2.3.Final-redhat-1.jar:5.2.3.Final-redhat-1]
	at org.infinispan.topology.CacheTopologyControlCommand.perform(CacheTopologyControlCommand.java:137) [infinispan-core-5.2.3.Final-redhat-1.jar:5.2.3.Final-redhat-1]
	at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.executeCommandFromLocalCluster(CommandAwareRpcDispatcher.java:253) [infinispan-core-5.2.3.Final-redhat-1.jar:5.2.3.Final-redhat-1]
	at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.handle(CommandAwareRpcDispatcher.java:220) [infinispan-core-5.2.3.Final-redhat-1.jar:5.2.3.Final-redhat-1]
	at org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:484) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:391) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:249) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:598) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.blocks.mux.MuxUpHandler.up(MuxUpHandler.java:130) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.JChannel.up(JChannel.java:707) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1020) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.RSVP.up(RSVP.java:172) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.FRAG2.up(FRAG2.java:181) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.FlowControl.up(FlowControl.java:400) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.FlowControl.up(FlowControl.java:418) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.pbcast.GMS.up(GMS.java:896) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:245) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.UNICAST2.up(UNICAST2.java:453) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.pbcast.NAKACK2.handleMessage(NAKACK2.java:721) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:574) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.FD_ALL.up(FD_ALL.java:187) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:288) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.MERGE2.up(MERGE2.java:205) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.Discovery.up(Discovery.java:359) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.TP$ProtocolAdapter.up(TP.java:2616) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.TP.passMessageUp(TP.java:1263) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.TP$IncomingPacket.handleMyMessage(TP.java:1825) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at org.jgroups.protocols.TP$IncomingPacket.run(TP.java:1798) [jgroups-3.2.7.Final-redhat-1.jar:3.2.7.Final-redhat-1]
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_37]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_37]
	at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_37]