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

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This exception has no message.
java.lang.NullPointerException:
at java.awt.LightweightDispatcher.stopListeningForOtherDrags(Container.java)
at java.awt.LightweightDispatcher.dispose(Container.java)
at java.awt.Container.removeNotify(Container.java)
at java.awt.Window.dispose(Window.java)
at java.awt.Frame.dispose(Frame.java)
at com.apple.mrj.JManager.JMAppletViewer_OLD.setState(JMAppletViewerOld.java)
at com.apple.mrj.JManager.JMViewerEvent.post(JMAppletViewerOld.java)
at com.apple.mrj.JManager.AVDispatcherThread.run(JMAppletViewerOld.java)

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