diff --git a/src/wp-includes/nav-menu.php b/src/wp-includes/nav-menu.php
index 9b6eeba9b3..863183a92b 100644
--- a/src/wp-includes/nav-menu.php
+++ b/src/wp-includes/nav-menu.php
@@ -456,11 +456,15 @@ function wp_update_nav_menu_item( $menu_id = 0, $menu_item_db_id = 0, $menu_item
 
 	$original_parent = 0 < $menu_item_db_id ? get_post_field( 'post_parent', $menu_item_db_id ) : 0;
 
-	if ( 'custom' != $args['menu-item-type'] ) {
-		/* if non-custom menu item, then:
-			* use original object's URL
-			* blank default title to sync with original object's
-		*/
+	if ( 'custom' === $args['menu-item-type'] ) {
+		// If custom menu item, trim the URL.
+		$args[ 'menu-item-url' ] = trim( $args[ 'menu-item-url' ] );
+	} else {
+		/*
+		 * If non-custom menu item, then:
+		 * - use the original object's URL.
+		 * - blank default title to sync with the original object's title.
+		 */
 
 		$args['menu-item-url'] = '';
 
diff --git a/tests/phpunit/tests/post/nav-menu.php b/tests/phpunit/tests/post/nav-menu.php
index 711a52d982..0f12e54ece 100644
--- a/tests/phpunit/tests/post/nav-menu.php
+++ b/tests/phpunit/tests/post/nav-menu.php
@@ -149,7 +149,7 @@ class Test_Nav_Menus extends WP_UnitTestCase {
 			array(
 				'menu-item-type'   => 'custom',
 				'menu-item-title'  => 'Wordpress.org',
-				'menu-item-link'   => 'http://wordpress.org',
+				'menu-item-url'    => 'http://wordpress.org',
 				'menu-item-status' => 'publish',
 			)
 		);
@@ -926,4 +926,34 @@ class Test_Nav_Menus extends WP_UnitTestCase {
 		$this->assertContains( 'menu-item-privacy-policy', $classes );
 	}
 
+	/**
+	 * @ticket 47723
+	 * @dataProvider data_trim_url_for_custom_item
+	 */
+	function test_trim_url_for_custom_item( $custom_url, $correct_url ) {
+		$custom_item_id = wp_update_nav_menu_item(
+			$this->menu_id,
+			0,
+			array(
+				'menu-item-type'   => 'custom',
+				'menu-item-title'  => 'WordPress.org',
+				'menu-item-url'    => $custom_url,
+				'menu-item-status' => 'publish',
+			)
+		);
+
+		$custom_item = wp_setup_nav_menu_item( get_post( $custom_item_id ) );
+		$this->assertEquals( $correct_url, $custom_item->url );
+	}
+
+	/**
+	 * Provides data for test_trim_url_for_custom_item().
+	 */
+	function data_trim_url_for_custom_item() {
+		return array(
+			array( 'https://wordpress.org ', 'https://wordpress.org' ),
+			array( ' https://wordpress.org', 'https://wordpress.org' ),
+		);
+	}
+
 }