Yeah, if you leave it your whole crop will be seeded, unless you're like a week from harvest, but even then I've seen plants start to produce seeds practically overnight. I'd chop it, or isolate it, or you could try a product by Dutch Masters called "Reverse", it's supposed to stop male flower production on hermies...But I'd just scrap it and have a "Yeah, I had a hermie, it sucked" story to add to my arsenal of growing smalltalk.