Online SEO training courses

Uncaught Error: Call to a member function get_price() on false
in /home/staging-yoast/staging-plugins.yoast.com/versions/9be75fd0910681faa88a21d190d08bdc088a1b66/web/app/themes/yoast-com/archive-yoast_courses.php on line 66

Call stack:

1. Yoast\Y\T\get_product_cards()
   app/themes/yoast-com/archive-yoast_courses.php:128
2. include('/home/staging-yoast/...ve-yoast_courses.php')
   wp-includes/template-loader.php:125
3. require_once('/home/staging-yoast/.../template-loader.php')
   wp-blog-header.php:19
4. require('/home/staging-yoast/...p/wp-blog-header.php')
   index.php:5