It is random. Unknown way how to reproduce. One report so far. It happens when IDE splash screen is displayed during IDE start - at least i looks like from call stack. Original report is at http://www.netbeans.org/issues/show_bug.cgi?id=165867.

Call stack:
java.lang.NullPointerException: HDC for component
        at sun.java2d.loops.Blit.Blit(Blit.java:0)
        at sun.java2d.pipe.DrawImage.blitSurfaceData(DrawImage.java:927)
        at sun.java2d.pipe.DrawImage.renderImageCopy(DrawImage.java:550)
        at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:54)
        at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:982)
        at sun.java2d.pipe.ValidatePipe.copyImage(ValidatePipe.java:168)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2979)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2964)
        at org.netbeans.core.startup.Splash$SplashComponent.paint(Splash.java:477)
        at javax.swing.JComponent._paintImmediately(JComponent.java:5082)
        at javax.swing.JComponent.paintImmediately(JComponent.java:4880)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:803)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)
        at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)