I'm writing a program to graph data and write the result as a GIF file. To this end it graphs in a BufferedImage and uses a GIF-encoding class which extracts the pixels using java.awt.image.PixelGrabber (it was based on 1.1).

However, when given this image PixelGrabber throws a NullPointerException. I'm sure there's other legacy code which will have the same problem.

I've put together a small program which demostrarates the bug. When it runs, the exception trace is:

java.lang.NullPointerException
        at java.awt.image.PixelGrabber.grabPixels(PixelGrabber.java:241)
        at java.awt.image.PixelGrabber.grabPixels(PixelGrabber.java:217)
        at PixelGrabberTest.main(PixelGrabberTest.java:68)