SQL Error WordPress Related Posts

I am using a WordPress Related posts from https://fabrizio.zellini.org/wordpress-related-posts-with-thumbs-revised

I wonder what this error is related to. Any ideas?

WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘WHERE post_status = ‘publish’ AND post_type = ‘post’ AND ID != 6961 ORDER BY RAN’ at line 1 for query SELECT ID, post_title, post_content,post_date, comment_count FROM WHERE post_status = ‘publish’ AND post_type = ‘post’ AND ID != 6961 ORDER BY RAND() LIMIT 4 made by require, require_once, include, wp_related_posts, wp_get_related_posts, wp_get_random_posts