Show ACF field with link to ultimate member profile/WordPress user profile below the post (single post layout)

I’m using Advanced Custom Fields and I’m trying to show a custom field below the single post. I managed to get the code to render below the post, but when I set the field movie_actors and save, the entire page goes blank after I refresh it, it doesn’t show any errors on the screen although I already have debug mode enabled.
My field is set as User Object inside ACF, and the field type is user.
What I’m trying to do is to show a link to the user profile in Ultimate Member. I also tried to show a link to the default wordpress user profile just in case, and it also gives me the same result.