I'm not sure I would call this issue "minor".
I've seen multiple users hit this issue now, on a variety of forms where they end up trying to refresh the data and things break.
I like Dan.s idea of redirecting to the owning page. Maybe form could add the check for null form data, and if it's null, add a message to the set of form errors, something regarding "form was submitted without data" and then kick back to the owning page. That would at least get the user back to teh form they were originally trying to submit, in a "responsible" state, with some informative message, rather than the app just blowing up.