title: SwiftMQ null pointer exception
body: <p>I'm getting this null pointer exception when connecting using the 7.5.0 client to a 9.7.3 router running java8.  We are testing upgrading to Universal Router v12, but we're not quite ready.  Any suggestions?</p>
  
  <pre><code>Got Exception:
      ThreadGroup: mgmt
      ActiveTask : PipelineQueue, dispatchToken=sys$mgmt.dispatchqueue
  Stack Trace: 
  java.lang.NullPointerException
          at com.swiftmq.impl.mgmt.standard.v750.DispatcherImpl.doExpire(Unknown Source)
          at com.swiftmq.impl.mgmt.standard.DispatchQueue.c(Unknown Source)
          at com.swiftmq.impl.mgmt.standard.DispatchQueue.visit(Unknown Source)
          at com.swiftmq.impl.mgmt.standard.po.CheckExpire.accept(Unknown Source)
          at com.swiftmq.tools.pipeline.PipelineQueue.process(Unknown Source)
          at com.swiftmq.tools.queue.SingleProcessorQueue.dequeue(Unknown Source)
          at com.swiftmq.tools.pipeline.PipelineQueue$QueueProcessor.run(Unknown Source)
          at com.swiftmq.impl.threadpool.standard.PoolThread.run(Unknown Source)
  </code></pre>