java.lang.NullPointerException

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    via by 807592,
    • java.lang.NullPointerException at javax.swing.plaf.basic.BasicInternalFrameUI$InternalFramePropertyChangeListener.propertyChange(Unknown Source) at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(Unknown Source) at javax.swing.JComponent.firePropertyChange(Unknown Source) at javax.swing.JInternalFrame.dispose(Unknown Source)
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