"javax.jms.JMSException: Unmatched acknowledge: MessageAck" with MQTT clients

Issue

Running A-MQ with MQTT clients we regularly see the following exception

2014-10-07 08:40:21,312 | WARN  | Q NIO Worker 615 | Service | ivemq.broker.TransportConnection  312 | 
121 - org.apache.activemq.activemq-osgi - 5.9.0.redhat-610394 | Async error occurred: 
javax.jms.JMSException: Unmatched acknowledge: MessageAck {commandId = 0, responseRequired = false, ackType = 2, 
consumerId = ID:ip-10-171-32-203-6014-141267764-1:2:-1:9, firstMessageId = null, 
lastMessageId = ID:ip-10-171-32-203-6014-141267764-1:45:-1:1:7, 
destination = topic://test, transactionId = null, messageCount = 1, poisonCause = null}; 
Expected message count (1) differs from count in dispatched-list (36)

What causes such behavior?