id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
19642	Toolbar shows a warning on a second call	SergeyBiryukov	ryan	"Slight regression from 3.2.

After upgrading to 3.3, some people saw the warning near the Toolbar:
{{{
Notice: Trying to get property of non-object in wp-includes/class-wp-admin-bar.php on line 342
Warning: Invalid argument supplied for foreach() in wp-includes/class-wp-admin-bar.php on line 342
}}}

* http://wordpress.org/support/topic/receiving-an-invalid-argument-error-on-homepage
* http://wordpress.org/support/topic/no-admin-toolbar-on-website-page-after-upgrade-to-33
* http://wordpress.org/support/topic/admin-bar-not-loading-blog-page-not-admin-side
* http://wordpress.org/support/topic/message-appears-across-top-of-site

This happens if a theme has two `wp_footer()` calls, or both `do_action('wp_footer')` and `wp_footer()` (which of course is wrong and weird, but didn't produce a warning in 3.2).

The problem is that `$wp_admin_bar->render()` doesn't check the result of `_bind()` (which returns nothing on a second call) before calling `_render()`:[[BR]]
http://core.trac.wordpress.org/browser/tags/3.3/wp-includes/class-wp-admin-bar.php#L197"	defect (bug)	closed	normal	3.3.1	Toolbar	3.3	normal	fixed	has-patch commit