Ajax call not working anymore

I figured it out using this previous post:

Issue with front-end ajax, getting a 302 redirect when accessing wp-admin/admin-ajax.php

Basically, I had added an action to prevent subscribers from seeing certain wordpress pages. 

  function limit_subscriber_access() {
    $redirect = home_url( "https://wordpress.stackexchange.com/" );
    if ( ! ( current_user_can( 'manage_options' ) || current_user_can( 'edit_posts' ) ))
        exit( wp_redirect( $redirect ) );
}

This was causing the 302 redirect and preventing the $wpdb related code from executing. Here is what I added:

  function limit_subscriber_access() {
    $redirect = home_url( "https://wordpress.stackexchange.com/" );
    if ( ! ( current_user_can( 'manage_options' ) || current_user_can( 'edit_posts' ) ) && !defined('DOING_AJAX'))
        exit( wp_redirect( $redirect ) );
}

I tested and it seems to be working how I wanted.

Thanks to everybody who helped me try to figure it out!

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