Errors from EventExceptionHandler

Hi,
  I am using Abbot to test a Swing project that also uses Java 3D.
After just launching the project via Abbort, sometimes, I get following exception:

080401 14:03:47:537
abbot.script.EventExceptionHandler.exceptionCaught(EventExceptionHandler.java:22):
       Unexpected exception while dispatching events:
080401 14:03:47:537 Exception thrown at
javax.swing.SwingUtilities.computeIntersection(Unknown Source)
       at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
       at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
       at javax.swing.RepaintManager.seqPaintDirtyRegions(Unknown Source)
       at
javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknown
Source)
       at java.awt.event.InvocationEvent.dispatch(Unknown Source)
       at java.awt.EventQueue.dispatchEvent(Unknown Source)
       at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown
Source)
       at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
       at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown
Source)
       at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
       at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
       at java.awt.EventDispatchThread.run(Unknown Source):
java.lang.NullPointerException
       (caught at
abbot.script.EventExceptionHandler.exceptionCaught(EventExceptionHandler.java:23))

How can this be fixed?

Thanks and Regards,
Medha