$50 · PENTAX MZ7 film camera and lens

Camera has some issues about shooting, when I release the shutter, the film keep rolling but cannot take any picture. It is good last time I used it, I have no idea of that issue, maybe it needs some repair. with 28-80 lens, lens is in perfect condition. So I’m asking for $50, just the lens worth it, camera is like free. Thank you.