sump pump discharge question

did a quick thru the wall discharge for the sump pump awhile back. this year, the outlet thru the wall froze up back into the garage a couple inches. should the discharge hose have a vacuum release on it inside the garage before it goes out the wall? this would be the kind that is used under a bar or island in the kitchen where you cannot hook up to the main stack. I was going to put it in, got lazy. thinking if it was in, the water would empty the hose completely and not plug it solid when it gets cold. Thoughts? Ideas? Thanks!