Happened in 8->16->8 elasticity tests with 6.1.0.ER5

This exception comes up:
03:48:04,765 ERROR [org.infinispan.server.hotrod.HotRodDecoder] (HotRodClientMaster-179) ISPN005009: Unexpected error before any request parameters read: java.lang.IndexOutOfBoundsException: 2
	at scala.collection.mutable.ResizableArray$class.apply(ResizableArray.scala:44)
	at scala.collection.mutable.ArrayBuffer.apply(ArrayBuffer.scala:47)
	at org.infinispan.server.hotrod.AbstractTopologyAwareEncoder1x$$anonfun$writeHashTopologyHeader$1$$anonfun$apply$mcVI$sp$1.apply$mcVI$sp(AbstractTopologyAwareEncoder1x.scala:99) [infinispan-server-hotrod-5.2.0.Beta5-redhat-1.jar:5.2.0.Beta5-redhat-1]
	at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:81)
	at org.infinispan.server.hotrod.AbstractTopologyAwareEncoder1x$$anonfun$writeHashTopologyHeader$1.apply$mcVI$sp(AbstractTopologyAwareEncoder1x.scala:96) [infinispan-server-hotrod-5.2.0.Beta5-redhat-1.jar:5.2.0.Beta5-redhat-1]
	at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:78)
	at org.infinispan.server.hotrod.AbstractTopologyAwareEncoder1x.writeHashTopologyHeader(AbstractTopologyAwareEncoder1x.scala:93) [infinispan-server-hotrod-5.2.0.Beta5-redhat-1.jar:5.2.0.Beta5-redhat-1]
	at org.infinispan.server.hotrod.AbstractEncoder1x.writeHeader(AbstractEncoder1x.scala:62) [infinispan-server-hotrod-5.2.0.Beta5-redhat-1.jar:5.2.0.Beta5-redhat-1]
	at org.infinispan.server.hotrod.HotRodEncoder.encode(HotRodEncoder.scala:63) [infinispan-server-hotrod-5.2.0.Beta5-redhat-1.jar:5.2.0.Beta5-redhat-1]
	at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.doEncode(OneToOneEncoder.java:67) [netty-3.5.9.Final.jar:]
	at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:60) [netty-3.5.9.Final.jar:]
	at org.jboss.netty.channel.Channels.write(Channels.java:712) [netty-3.5.9.Final.jar:]
	at org.jboss.netty.channel.Channels.write(Channels.java:679) [netty-3.5.9.Final.jar:]
	at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:248) [netty-3.5.9.Final.jar:]
	at org.infinispan.server.core.AbstractProtocolDecoder.writeResponse(AbstractProtocolDecoder.scala:179) [infinispan-server-core-5.2.0.Beta5-redhat-1.jar:5.2.0.Beta5-redhat-1]
	at org.infinispan.server.core.AbstractProtocolDecoder.decodeKey(AbstractProtocolDecoder.scala:115) [infinispan-server-core-5.2.0.Beta5-redhat-1.jar:5.2.0.Beta5-redhat-1]
	at org.infinispan.server.core.AbstractProtocolDecoder.decode(AbstractProtocolDecoder.scala:71) [infinispan-server-core-5.2.0.Beta5-redhat-1.jar:5.2.0.Beta5-redhat-1]
	at org.infinispan.server.core.AbstractProtocolDecoder.decode(AbstractProtocolDecoder.scala:47) [infinispan-server-core-5.2.0.Beta5-redhat-1.jar:5.2.0.Beta5-redhat-1]
	at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:502) [netty-3.5.9.Final.jar:]
	at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:437) [netty-3.5.9.Final.jar:]
	at org.infinispan.server.core.AbstractProtocolDecoder.messageReceived(AbstractProtocolDecoder.scala:387) [infinispan-server-core-5.2.0.Beta5-redhat-1.jar:5.2.0.Beta5-redhat-1]
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268) [netty-3.5.9.Final.jar:]
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255) [netty-3.5.9.Final.jar:]
	at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:84) [netty-3.5.9.Final.jar:]
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.processSelectedKeys(AbstractNioWorker.java:472) [netty-3.5.9.Final.jar:]
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:333) [netty-3.5.9.Final.jar:]
	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:35) [netty-3.5.9.Final.jar:]
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_33]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_33]
	at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_33]