NPE in HornetQ RA when MDB is undeployed while delivering messages

In attached simple Arquillian test, the MDB is undeployed while messages are being re-delivered to a failing MDB. During undeployment, following exception is thrown:

Failed to call onMessage(): java.lang.NullPointerException
at org.hornetq.ra.inflow.HornetQMessageHandler.onMessage(HornetQMessageHandler.java:336)
at org.hornetq.core.client.impl.ClientConsumerImpl.callOnMessage(ClientConsumerImpl.java:983) [hornetq-core-2.2.13.Final.jar:]
at org.hornetq.core.client.impl.ClientConsumerImpl.access$400(ClientConsumerImpl.java:48) [hornetq-core-2.2.13.Final.jar:]
at org.hornetq.core.client.impl.ClientConsumerImpl$Runner.run(ClientConsumerImpl.java:1113) [hornetq-core-2.2.13.Final.jar:]
at org.hornetq.utils.OrderedExecutorFactory$OrderedExecutor$1.run(OrderedExecutorFactory.java:100) [hornetq-core-2.2.13.Final.jar:]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [classes.jar:1.6.0_31]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [classes.jar:1.6.0_31]
at java.lang.Thread.run(Thread.java:680) [classes.jar:1.6.0_31]