Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
The exception you received comes directly from the TIFF delegate library. You either have a corrupt TIFF image or there is a bug in the TIFF delegate library. If you don't have the latest version of TIFF, try downloading and see if it works with your images.