I ran Dark on what was likely an MSP with no actual files to install or anything else to patch (I was trying to confirm that the MSP - which I had generated - was in fact buggy in that very respect). Dark crashes with a NullReferenceException (stack: UnbindTransform, UnbindPatch, Unbind, Run).
This exception appears after the DARK0001: Object reference not set to an instance of an object line.
2012-01-05 10:27:52 PST in Windows Installer...