Failed to decode: java.lang.IllegalArgumentException: Invalid type: 0

Issue

• In my cluster of two nodes of EAP 6.0.1 HornetQ, I have a lot of errors in my log :

ERROR [org.hornetq.core.protocol.core.impl.RemotingConnectionImpl] (Old I/O client worker ([id: 0x6ecf573a, /aaa.bbb.ccc.ddd:12105 => /eee.fff.ggg.hhh:5626])) 
Failed to decode: java.lang.IllegalArgumentException: Invalid type: 0 
at org.hornetq.core.protocol.core.impl.PacketDecoder.decode(PacketDecoder.java:550) [hornetq-core-2.2.23.Final-redhat-1.jar:2.2.19.SNAPSHOT (HQ_2_2_23_Final, 122)] 
at org.hornetq.core.protocol.core.impl.RemotingConnectionImpl.bufferReceived(RemotingConnectionImpl.java:479) [hornetq-core-2.2.23.Final-redhat-1.jar:2.2.19.SNAPSHOT (HQ_2_2_23_Final, 122)] 
at org.hornetq.core.client.impl.ClientSessionFactoryImpl$DelegatingBufferHandler.bufferReceived(ClientSessionFactoryImpl.java:1543) [hornetq-core-2.2.23.Final-redhat-1.jar:2.2.19.SNAPSHOT (HQ_2_2_23_Final, 122)] 

• What is the cause of these log ?