diff --git a/src/wp-admin/js/customize-nav-menus.js b/src/wp-admin/js/customize-nav-menus.js
index a8e314d..096a31b 100644
--- a/src/wp-admin/js/customize-nav-menus.js
+++ b/src/wp-admin/js/customize-nav-menus.js
@@ -545,15 +545,8 @@
 			if ( '' === itemName.val() ) {
 				itemName.addClass( 'invalid' );
 				return;
-			} else if ('' === itemUrl.val() ||
-				'http://' === itemUrl.val() ||
-				// Copyright (c) 2010-2013 Diego Perini, MIT licensed
-				// https://gist.github.com/dperini/729294
-				// see also https://mathiasbynens.be/demo/url-regex
-				// modified to allow protocol-relative URLs
-				/^(?:(?:(?:https?|ftp):)?\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})).?)(?::\d{2,5})?(?:[/?#]\S*)?$/i.test(value)
-			) {
-				itemUrl.addClass('invalid');
+			} else if ( '' === itemUrl.val() || 'http://' === itemUrl.val() ) {
+				itemUrl.addClass( 'invalid' );
 				return;
 			}
 
diff --git a/src/wp-includes/customize/class-wp-customize-nav-menu-item-setting.php b/src/wp-includes/customize/class-wp-customize-nav-menu-item-setting.php
index efa63f6..11b5cd6 100644
--- a/src/wp-includes/customize/class-wp-customize-nav-menu-item-setting.php
+++ b/src/wp-includes/customize/class-wp-customize-nav-menu-item-setting.php
@@ -722,12 +722,7 @@ class WP_Customize_Nav_Menu_Item_Setting extends WP_Customize_Setting {
 		$menu_item_value['attr_title'] = wp_unslash( apply_filters( 'excerpt_save_pre', wp_slash( $menu_item_value['attr_title'] ) ) );
 		$menu_item_value['description'] = wp_unslash( apply_filters( 'content_save_pre', wp_slash( $menu_item_value['description'] ) ) );
 
-		if ( '' !== $menu_item_value['url'] ) {
-			$menu_item_value['url'] = esc_url_raw( $menu_item_value['url'] );
-			if ( '' === $menu_item_value['url'] ) {
-				return new WP_Error( 'invalid_nav_menu_url', __( 'Invalid URL.' ) ); // Fail sanitization if URL is invalid.
-			}
-		}
+		$menu_item_value['url'] = esc_url_raw( $menu_item_value['url'] );
 		if ( 'publish' !== $menu_item_value['status'] ) {
 			$menu_item_value['status'] = 'draft';
 		}