From 0e4935d078c7534ac90741587577ae1644e58f9d Mon Sep 17 00:00:00 2001
From: Andrew Nacin <nacin@git.wordpress.org>
Date: Fri, 30 Dec 2011 23:04:28 +0000
Subject: [PATCH] Make sure that _render() is only called with a valid root
 object. As in, render() can only be validly called once and must not fail on
 the second call. props SergeyBiryukov, see #19642 for trunk.

git-svn-id: https://develop.svn.wordpress.org/trunk@19638 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/class-wp-admin-bar.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/wp-includes/class-wp-admin-bar.php b/wp-includes/class-wp-admin-bar.php
index 8ee6d1cf20..1b8f8b3391 100644
--- a/wp-includes/class-wp-admin-bar.php
+++ b/wp-includes/class-wp-admin-bar.php
@@ -196,7 +196,8 @@ class WP_Admin_Bar {
 
 	public function render() {
 		$root = $this->_bind();
-		$this->_render( $root );
+		if ( $root )
+			$this->_render( $root );
 	}
 
 	final protected function _bind() {