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Edit File: class-admin-ajax.php

<?php

class MC4WP_Admin_Ajax
{
    /**
     * @var MC4WP_Admin_Tools
     */
    protected $tools;

/**
     * MC4WP_Admin_Ajax constructor.
     *
     * @param MC4WP_Admin_Tools $tools
     */
    public function __construct(MC4WP_Admin_Tools $tools)
    {
        $this->tools = $tools;
    }

/**
     * Hook AJAX actions
     */
    public function add_hooks()
    {
        add_action('wp_ajax_mc4wp_renew_mailchimp_lists', array( $this, 'refresh_mailchimp_lists' ));
        add_action('wp_ajax_mc4wp_get_list_details', array( $this, 'get_list_details' ));
    }

/**
     * Empty lists cache & fetch lists again.
     */
    public function refresh_mailchimp_lists()
    {
        if (! $this->tools->is_user_authorized()) {
            wp_send_json_error();
            return;
        }

check_ajax_referer('mc4wp-ajax');

$mailchimp = new MC4WP_MailChimp();
        $success   = $mailchimp->refresh_lists();
        wp_send_json($success);
    }

/**
     * Retrieve details (merge fields and interest categories) for one or multiple lists in Mailchimp
     * @throws MC4WP_API_Exception
     */
    public function get_list_details()
    {
        if (! $this->tools->is_user_authorized()) {
            wp_send_json_error();
            return;
        }

$list_ids  = (array) explode(',', $_GET['ids']);
        $data      = array();
        $mailchimp = new MC4WP_MailChimp();
        foreach ($list_ids as $list_id) {
            $data[] = (object) array(
                'id'                  => $list_id,
                'merge_fields'        => $mailchimp->get_list_merge_fields($list_id),
                'interest_categories' => $mailchimp->get_list_interest_categories($list_id),
                'marketing_permissions' => $mailchimp->get_list_marketing_permissions($list_id),
            );
        }

if (isset($_GET['format']) && $_GET['format'] === 'html') {
            $merge_fields          = $data[0]->merge_fields;
            $interest_categories   = $data[0]->interest_categories;
            $marketing_permissions = $data[0]->marketing_permissions;
            require MC4WP_PLUGIN_DIR . '/includes/views/parts/lists-overview-details.php';
        } else {
            wp_send_json($data);
        }
        exit;
    }
}

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