Null pointer in message selector in 0.7.7-alpha-3

I am getting a null pointer exception in 0.7.7-alpha-3. I do not get this consistently.

I am using message selectors on my queue.

Has anyone encountered this, and if so, is there a fix?

Jean-Francois Theoret

10:39:33.743 ERROR [ORB-Worker-6] - 
java.lang.NullPointerException
        at org.exolab.jms.selector.Identifier.evaluate(Identifier.java:142)
        at org.exolab.jms.selector.LogicalOperator.evaluate(LogicalOperator.java:86)
        at org.exolab.jms.selector.Selector.selects(Selector.java:262)
        at org.exolab.jms.messagemgr.QueueDestinationCache.getMessage(QueueDestinationCache.java:241)
        at org.exolab.jms.messagemgr.QueueConsumerEndpoint.doReceive(QueueConsumerEndpoint.java:153)
        at org.exolab.jms.messagemgr.AbstractConsumerEndpoint.receive(AbstractConsumerEndpoint.java:233)
        at org.exolab.jms.server.SessionConsumer.doReceive(SessionConsumer.java:647)
        at org.exolab.jms.server.SessionConsumer.receive(SessionConsumer.java:380)
        at org.exolab.jms.server.ServerSessionImpl.receive(ServerSessionImpl.java:270)
        at org.exolab.jms.server.net.RemoteServerSession.receive(RemoteServerSession.java:195)
        at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.exolab.jms.net.orb.DefaultORB$Handler.invoke(DefaultORB.java:553)
        at org.exolab.jms.net.orb.DefaultORB$1.run(DefaultORB.java:511)
        at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)


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