I don't think that interpretation makes that much sense. Isn't it a bit too... obvious that you shouldn't just crash and/or corrupt data on invalid input? If the law were essentially "Don't crash or corrupt data on invalid input", it would seem to me that an even better law would be: "Don't crash or corrupt data." Surely there aren't too many situations where we'd want to avoid crashing because of bad input, but we'd be totally fine crashing or corrupting data for some other (expected) reason.

So, I think not crashing because of invalid input is probably too obvious to be a "law" bearing someone's name. IMO, it must be asserting that we should try our best to do what the user/client means so that they aren't frustrated by having to be perfect.