It is self-contradictory. The book for The Neverending Story is a lot longer, but that too does eventually end. I enjoyed the book much more than the movie anyway. The movie only covered like the first half of the book.
I consider that a good thing.
If it were truly a never-ending story, I would still be at my folks house watching away and would have never gotten to see "The Never-Ending Story II" or "The Never-Ending Story III."