Modify get_permalink with a specific filter
Solved!, Change $postID by $post->ID, so, rewriting function: function noticias_print_permalink( $permalink, $post, $leavename ){ $external_link = get_post_meta( $post->ID, ‘external_link’, true ); if( !empty( $external_link ) ) { $permalink = $external_link; } return $permalink; } Regards.