diff --git src/wp-includes/class-wp-customize-nav-menus.php src/wp-includes/class-wp-customize-nav-menus.php
index 1a55fa6ce2..d2a346d5b0 100644
--- src/wp-includes/class-wp-customize-nav-menus.php
+++ src/wp-includes/class-wp-customize-nav-menus.php
@@ -324,7 +324,7 @@ final class WP_Customize_Nav_Menus {
 
 		// Prepend list of posts with nav_menus_created_posts search results on first page.
 		$nav_menus_created_posts_setting = $this->manager->get_setting( 'nav_menus_created_posts' );
-		if ( 1 === $args['pagenum'] && $nav_menus_created_posts_setting && count( $nav_menus_created_posts_setting ) > 0 ) {
+		if ( 1 === $args['pagenum'] && $nav_menus_created_posts_setting && count( $nav_menus_created_posts_setting->value() ) > 0 ) {
 			$stub_post_query = new WP_Query(
 				array_merge(
 					$query,