Error at checkout

Working on a local server and developing Shop, I get the following when I click "Checkout."

I did delete all members soon before the result below.

PHP Fatal error: Call to a member function to_array() on boolean in /Applications/MAMP/htdocs/lgoose/perch/addons/apps/perch_shop/lib/PerchShop_Order.class.php on line 323

Line 323 is:

$Email->set_bulk($Member->to_array());

Diagnostics Report:

      Summary information

    Perch Runway: 3.1.2, PHP: 5.6.28, MySQL: mysqlnd 5.0.11-dev - 20120503 - $Id: 76b08b24596e12d4553bd41fc93cccd5bac2fe7a $, with PDO
    Server OS: Darwin, apache2handler
    Installed apps: content (3.1.2), assets (3.1.2), categories (3.1.2), perch_blog (5.6.1), perch_events (1.9.5), perch_forms (1.12), perch_gallery (2.8.9), perch_shop_orders (1.2.6), perch_shop_products (1.2.6), perch_shop (1.2.6), perch_members (1.6.4)
    App runtimes: <?php $apps_list = [ 'content', 'categories', 'perch_members', 'perch_shop', 'perch_blog', 'perch_forms', 'perch_gallery', 'perch_events', ];
    PERCH_LOGINPATH: /perch
    PERCH_PATH: /Applications/MAMP/htdocs/lgoose/perch
    PERCH_CORE: /Applications/MAMP/htdocs/lgoose/perch/core
    PERCH_RESFILEPATH: /Applications/MAMP/htdocs/lgoose/perch/resources
    Image manipulation: GD
    PHP limits: Max upload 32M, Max POST 32M, Memory: 128M, Total max file upload: 32M
    F1: 3b606135b33e6a102526838f4152a807
    Resource folder writeable: Yes
    HTTP_HOST: lgoose.loc
    DOCUMENT_ROOT: /Applications/MAMP/htdocs/lgoose
    REQUEST_URI: /perch/core/settings/diagnostics/
    SCRIPT_NAME: /perch/core/settings/diagnostics/index.php

The checkout page:

<?php
//Section below is the perch-supplied set-up for manual processing
    if (!perch_member_logged_in()) {
        PerchSystem::redirect('/shop/checkout');
    }

//The following was the default entry   
/*
    if (perch_shop_cart_has_property('terms_agreed')) {
        perch_shop_checkout('manual', [
        'return_url' => '/shop/result',
        'cancel_url' => '/shop',
        ]);
}
*/
//End default entry 

//Following  are from Perch Documentation for Paypal Express
if (perch_member_logged_in()) {

  //your 'success' return URL
  $return_url = 'https://staging.lonegoosepress.com/payment';
  $cancel_url = 'https://staging.lonegoosepress.com/index.php/';

  perch_shop_checkout('paypal-express', [
    'return_url' => $return_url,
    'cancel_url' => $cancel_url,
  ]);
}
//End part 1 of PayPal Express from documentation
//The following is part 2 from documentation
 perch_shop_complete_payment('paypal-express');

  if (perch_shop_order_successful()) {
      echo '<h1>Thank you for your order!</h1>';
    }else{
      echo '<h1>Sorry!</h1>';
    }
//End part 2 of documentation

    perch_layout('global.above', array(
            'title'           => perch_page_title(true),
            'section_heading' => 'shop',
        ));


    // Show the cart with a non-interactive template
    perch_shop_cart([
        'template'=>'cart/cart_static.html'
    ]);

    // Show the order addresses
    perch_shop_order_addresses();

    // Display the form with the T&Cs checkbox
    perch_shop_form('checkout/confirm.html');

    perch_layout('shop.sidebar', array(
            'promo' => false,
            'shipping' => false,
            'currency' => false,
            'minicart' => false,
            'social' => false,
        ));

    perch_layout('global.below');
?>