Er, I dunno.
Hibernation is supposed to save the state of all applications and then restore them when the app comes back.
Frankly, I don't see it as a high priority bug, but the original poster may disagree. When you bring your PC out of hibernation, I figure you are wanting to get to work. So the error message looks bad, but there was no real expectation that the screen saver was going to start running again.
Maybe take that out-of-hibernation message from Windows and gracefully exit rather than trying to resume execution? Unfortunately hibernation is rather buggy on desktop PCs. It works best on laptops which I am guessing you do not have one to test.