Probleme exception JCChartLegendManager

Bonjour,

j'ai une exception lié au dessin dans le JCChartLabelManager.

Code:

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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at com.klg.jclass.chart.JCChartLegendManager.setFillGraphics(Unknown Source)
	at com.klg.jclass.util.legend.JCLegend.drawLegendItem(Unknown Source)
	at com.klg.jclass.util.legend.JCLegend.paintComponent(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at com.klg.jclass.chart.JCChart.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at com.klg.jclass.chart.JCChart.paint(Unknown Source)
	at javax.swing.JComponent.paintToOffscreen(Unknown Source)
	at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
	at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
	at javax.swing.RepaintManager.paint(Unknown Source)
	at javax.swing.JComponent._paintImmediately(Unknown Source)
	at javax.swing.JComponent.paintImmediately(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)

Le probleme c'est que l'exception est dans la jclass et je n'est pas le source. (il est pas libre.). Du coup je ne sais pas ce qui cause cette exception.
Est ce que quelqu'un a déjà recontré cette exception ?? Et a su la résoudre ??

Merci d'avance.