Function wp_get_nav_menu_items - Fatal error - Wordpress 3.5 and earlier

[sporky]

The function wp_get_nav_menu_items fails when a "Page" type post has been added to a menu.

This is a fresh install of Wordpress 3.5, using the "Sample Page" page added to a menu called "main_menu". This menu has no other menu options added to it. This bug also occurs in earlier versions of Wordpress.

Sample PHP Code:

<?php

$menu_name = 'main_menu';

$nav_menu_object = wp_get_nav_menu_object($menu_name);

$menu_id = $nav_menu_object->term_id;

$menu_items = wp_get_nav_menu_items($menu_id); <<--- Error occurs here

?>

The following error occurs:

Fatal error: Call to a member function get_page_permastruct() on a non-object in C:\xampp\htdocs\lchs4\wp-includes\link-template.php on line 271

This occurs in the following area of code:

function _get_page_link( $post = false, $leavename = false, $sample = false ) {
	global $wp_rewrite;

	$post = get_post( $post );

	$draft_or_pending = in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft' ) );

	$link = $wp_rewrite->get_page_permastruct(); <--- happens here

Essentially, the variable $wp_rewrite shows as <Uninitialized> when viewed in xdebug using Eclipse.