Le notti del terrore

The name of this movie is Le notti del terrore released in 1981-01-23 and it's main theme is Professor Ayres discovers a secret in an ancient stone and when he opens a crypt, he revives zombies that kill him. He had invited three couples to visit him in his manor to reveal his discovery. However, they never get around to meeting the professor. Out of the blue, the zombies attack them and they seek shelter in the mansion..