function exclude_protected_memberpress_posts( $query ) {

    // Ensure we are not in the admin area and it's the main query

    if ( ! is_admin() && $query->is_main_query() ) {

        // Check if we are on the repeater field context

        if ( function_exists( 'get_field' ) && get_field( 'your_repeater_field_name' ) ) {

            $posts_to_exclude = array();

            // Get all posts

            $posts = get_posts( array(

                'post_type'   => get_post_types(),

                'post_status' => 'publish',

                'numberposts' => -1

            ) );

            // Loop through each post and check if it's protected

            foreach ( $posts as $post ) {

                if ( MeprRule::is_locked( $post ) ) {

                    $posts_to_exclude[] = $post->ID;

                }

            }

            // Exclude protected posts from the query

            if ( ! empty( $posts_to_exclude ) ) {

                $query->set( 'post__not_in', $posts_to_exclude );

            }

        }

    }

}

// Attach the 'exclude_protected_memberpress_posts' function to the 'pre_get_posts' action.

add_action( 'pre_get_posts', 'exclude_protected_memberpress_posts' );