I don't think it's just a misprint. On the Emil Hartmann page there's also a Serenade op. 24 which I guess must be another edition of the same piece. It's locked, so I can't download it and check it out, but the instrumentation is the same and the number of pages, while slightly different (58 and 53 pages respectively), is close enough to assume that it is the same piece.
Any moderators willing to look into this?
