WPMUDEV Support, Unfortunately I have reached the limit

Hi WPMUDEV Support,
Unfortunately I have reached the limit of my knowledge with a couple issues which seem to be tied together.

I am using wooCommerce to process payments and memberships ( I know... I tried to use Membership2 but it wouldn't work for me and couldn't be integrated with my tracking system payments).
So, *WooCommerce was working fine but when I updated to WP v.4.3.2 - it seems I am getting DOING_AJAX error. But the error ONLY appears after clicking to process an order from the cart (which should send me to paypal to process payment) - after clicking to order, my site shows these errors (and does not redirect me to paypal):

Notice: Undefined index: DOING_AJAX in /home/paidlink/public_html/wp-content/mu-plugins/grd_functions.php on line 153

Warning: Cannot modify header information - headers already sent by (output started at /home/paidlink/public_html/wp-content/mu-plugins/grd_functions.php:153) in /home/paidlink/public_html/wp-includes/pluggable.php on line 1196

I can't find the problem. My Mu-Plugins were fine before. Not sure what's going on now.
I have Debug on because My WooCommerce was not clicking through to PayPal.

Anyone have any insite?
Maybe someone know this has happened before?

Anything would be a help. All of my work doesn't matter if I can't even process payments properly.

Thanks again for your time.

  • Vinod Dalvi
    • WP Unicorn

    Hi Paul,

    Sorry to hear of the problem you are having.

    It seems the error is occurring due to the following mu plugin.


    Why are you using that plugin?

    Could you please try temporary disabling that plugin by removing it from the above path?

    Kind Regards,
    Vinod Dalvi

  • Paul
    • The Crimson Coder

    It's just a host plugin for me.
    I will go now and separate each function into a different plugin. I was intending to do this before but I feel now is the time.

    I will do this and conduct my tests again to see which function is causing the error.

    Thanks for the reminder.

  • Paul
    • The Crimson Coder

    @Vinod Dalvi,

    It seems your simple reply lead me to the fix. Thank you very much!
    I separated all functions into different php files and was able to pinpoint the issue.

    I had added a code which didn't need to be there.

    Thank you again.


  • Paul
    • The Crimson Coder

    FYI to anyone:
    The code was:

    add_action('admin_init', 'no_mo_dashboard');
    function no_mo_dashboard() {
    if (!current_user_can('manage_options') && $_SERVER['DOING_AJAX'] != '/wp-admin/admin-ajax.php') {
    wp_redirect(home_url()); exit;

    It tells the admin dashboard to direct any primary site admin menu items to main site url. Best I can describe it. Works well but was causing issues for me.

    Have to find another solution.

  • Paul
    • The Crimson Coder

    Found FAR better solution - Just remove primary site blog from mySites menu for non-Network Admins!

    So if you too are having problems with DOING_AJAX - Try this - Perfect for me:

    // Remove Blog 1 main site from mysites list.
    function remove_main_blog_from_get_blogs($blogs) {
    	// check that user is not Network Admin
    	if ( !is_super_admin() ) {
    		// remove first item from $blogs array, which should always be main blog
    		array_splice($blogs, 0, 1);
    	return $blogs;
    add_filter( 'get_blogs_of_user', 'remove_main_blog_from_get_blogs' );

    Hope it helps.


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