Make WordPress Core

Opened 20 months ago

Last modified 20 months ago

#43625 new defect (bug)

When there are invalid items in a menu, the customizer enters an infinite loop of refreshing when trying to render wp_nav_menu.

Reported by: flamboyantpretender Owned by:
Milestone: Awaiting Review Priority: normal
Severity: normal Version: 4.9.5
Component: Customize Keywords:
Focuses: javascript, administration Cc:
PR Number:


I had an issue where I echoed certain things on the homepage.

Strangely enough, removing that part of code fixed it, but adding something that would 'echo' things out broke it again.

Long story short, I decoupled every single thing in my theme and discovered that when you call wp_nav_menu, like so:

                            wp_nav_menu( array(
                                'theme_location'=> 'menu-1',
                                'menu_id'       => 'primary-menu',
                                'menu_class'    => 'menu szWeo1-unique-menu',
                                'container'        => 'false'
                            ) );

but there are invalid items (removed pages or so, I believe) within that menu, the Customizer enters an infinite refresh loop and it tries to re-render that menu, but gets stuck, aborts and repeats.

Replication should be easy, simply create an item in the menu that corresponds to a page, then delete that page. This should render the item within the menu "invalid". I can't exactly say that this will work, but please do contribute if you know a way of rendering these items invalid in a consistent way.

Change History (1)

#1 @flamboyantpretender
20 months ago

Update: Can confirm, adding a page link to the menu and then later on removing that page renders a menu item "invalid".

Update2: It seems the error is actually triggered by calling another outer file that echoes something, but the error gets fixed by removing the invalid menu item.

I created a new file:


function echo_hey() {
    echo 'hey';


Linked it up within my functions.php, as such:

require_once( get_template_directory_uri() . '/inc/echo_hello.php');

Then, within my header.php (or really anywhere), I called it:


This printed the 'hey' but sent the Customizer into the refresh loop and generated this error at times:

( ! ) Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\wordpress\wp-content\themes\s-master\includes\Sprout\Contact\ContactBlock.php:16) in C:\xampp\htdocs\wordpress\wp-admin\includes\misc.php on line 1114

Keep in mind that this is with output_buffering set to Off in the php.ini file, but if we allow a buffer of, say, 4096, this error dissapears, but the refresh bug still happens if we have an invalid menu item.

Version 2, edited 20 months ago by flamboyantpretender (previous) (next) (diff)
Note: See TracTickets for help on using tickets.