Movies without entry?

Hello to everyone. A few hours ago, by pure chance, I found an IMDb list from a user who compiled some based-on Lovecraft's movies, arguing that it would be incomplete because some movies have no entry on IMDb. That's my question: is it really possible that there are movies based/inspired on Lovecraft without entry in IMDb?

(PS: please warm me if the post is in a wrong category to put it right; I always have difficulties to post)