SuspectExceptions thrown during MapReduceTask while removing the intermediate cache

16:13:51,325 ERROR [org.radargun.stages.MapReduceStage] (pool-1-thread-1) executeMapReduceTask() returned an exception
org.infinispan.commons.CacheException: Error removing cache
	at org.infinispan.manager.DefaultCacheManager.removeCache(DefaultCacheManager.java:471)
	at org.infinispan.distexec.mapreduce.MapReduceTask.execute(MapReduceTask.java:353)
	at org.infinispan.distexec.mapreduce.MapReduceTask.execute(MapReduceTask.java:634)
	at org.radargun.cachewrappers.InfinispanMapReduce.executeMapReduceTask(InfinispanMapReduce.java:91)
	at org.radargun.cachewrappers.Infinispan51Wrapper.executeMapReduceTask(Infinispan51Wrapper.java:198)
	at org.radargun.stages.MapReduceStage.executeMapReduceTask(MapReduceStage.java:212)
	at org.radargun.stages.MapReduceStage.executeOnSlave(MapReduceStage.java:164)
	at org.radargun.Slave$2.run(Slave.java:103)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
Caused by: org.infinispan.remoting.RemoteException: ISPN000217: Received exception from edg-perf06-46939, see cause for remote stack trace
	at org.infinispan.remoting.transport.AbstractTransport.checkResponse(AbstractTransport.java:41)
	at org.infinispan.remoting.transport.AbstractTransport.parseResponseAndAddToResponseList(AbstractTransport.java:66)
	at org.infinispan.remoting.transport.jgroups.JGroupsTransport.invokeRemotely(JGroupsTransport.java:547)
	at org.infinispan.manager.DefaultCacheManager.removeCache(DefaultCacheManager.java:463)
	... 12 more
Caused by: org.infinispan.commons.CacheException: Problems invoking command.
	at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.handle(CommandAwareRpcDispatcher.java:221)
	at org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:460)
	at org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:377)
	at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:247)
	at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:665)
	at org.jgroups.JChannel.up(JChannel.java:708)
	at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1015)
	at org.jgroups.protocols.RSVP.up(RSVP.java:187)
	at org.jgroups.protocols.FRAG2.up(FRAG2.java:165)
	at org.jgroups.protocols.FlowControl.up(FlowControl.java:370)
	at org.jgroups.protocols.FlowControl.up(FlowControl.java:381)
	at org.jgroups.protocols.pbcast.GMS.up(GMS.java:1010)
	at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:234)
	at org.jgroups.protocols.UNICAST3.up(UNICAST3.java:390)
	at org.jgroups.protocols.pbcast.NAKACK2.handleMessage(NAKACK2.java:774)
	at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:570)
	at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:147)
	at org.jgroups.protocols.FD_ALL.up(FD_ALL.java:184)
	at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:301)
	at org.jgroups.protocols.MERGE2.up(MERGE2.java:209)
	at org.jgroups.protocols.Discovery.up(Discovery.java:379)
	at org.jgroups.protocols.TP.passMessageUp(TP.java:1370)
	at org.jgroups.protocols.TP$MyHandler.run(TP.java:1556)
	... 3 more
Caused by: java.lang.NullPointerException
	at org.infinispan.commands.RemoteCommandsFactory.fromStream(RemoteCommandsFactory.java:195)
	at org.infinispan.marshall.exts.ReplicableCommandExternalizer.fromStream(ReplicableCommandExternalizer.java:106)
	at org.infinispan.marshall.exts.CacheRpcCommandExternalizer.readObject(CacheRpcCommandExternalizer.java:147)
	at org.infinispan.marshall.exts.CacheRpcCommandExternalizer.readObject(CacheRpcCommandExternalizer.java:59)
	at org.infinispan.marshall.core.ExternalizerTable$ExternalizerAdapter.readObject(ExternalizerTable.java:389)
	at org.infinispan.marshall.core.ExternalizerTable.readObject(ExternalizerTable.java:205)
	at org.infinispan.marshall.core.JBossMarshaller$ExternalizerTableProxy.readObject(JBossMarshaller.java:152)
	at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:355)
	at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:213)
	at org.jboss.marshalling.AbstractObjectInput.readObject(AbstractObjectInput.java:37)
	at org.infinispan.commons.marshall.jboss.AbstractJBossMarshaller.objectFromObjectStream(AbstractJBossMarshaller.java:136)
	at org.infinispan.marshall.core.VersionAwareMarshaller.objectFromByteBuffer(VersionAwareMarshaller.java:101)
	at org.infinispan.commons.marshall.AbstractDelegatingMarshaller.objectFromByteBuffer(AbstractDelegatingMarshaller.java:80)
	at org.infinispan.remoting.transport.jgroups.MarshallerAdapter.objectFromBuffer(MarshallerAdapter.java:28)
	at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.handle(CommandAwareRpcDispatcher.java:206)
	... 25 more