java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.util.Hashtable.put(Hashtable.java:398)
at oracle.jms.AQjmsMessage.convertPropertyListToHashtable(AQjmsMessage.java:2377)
at oracle.jms.AQjmsConsumer.dequeue(AQjmsConsumer.java:2012)
at oracle.jms.AQjmsConsumer.receiveFromAQ(AQjmsConsumer.java:916)
at oracle.jms.AQjmsConsumer.receiveFromAQ(AQjmsConsumer.java:835)
at oracle.jms.AQjmsConsumer.receive(AQjmsConsumer.java:745)
at com.evermind.server.ejb.MessageDrivenHome.run(MessageDrivenHome.java:926)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186)
at java.lang.Thread.run(Thread.java:534)

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