Uncaught Error Breaks REST API

We host at SiteGround. I was having trouble with SGoptimizer saving its settings. The error message was “Could not connect to WordPress REST API” Screenshot: https://prnt.sc/vlx3z2 I could not figure out the problem. I thought it was with PHP 7.4, or Wordfence, but it was not. I eventually asked SiteGround for support, and they told me the following: Thank you for contacting our Help Desk! I investigated the matter and was able to find the following error generated due to the free-shipping-notification-woocommerce-pro plugin: Fatal error: Uncaught Error: Call to a member function get_displayed_subtotal() on null in /home/puretekstore/public_html/wp-content/plugins/free-shipping-notification-woocommerce-pro/public/class-pisol-fsnw-min.php on line 12 I have now deactivated the plugin to verify that the reported issue is resolved, please test to verify this on your end as well. As you can see, they had to deactivate your Free Shipping pro plugin, but our client likes what it does. Can you help to debug it? Or can you fix it? -Mark This topic was modified 5 years, 6 months ago by westhillsweb . The page I need help with: [ log in to see the link] Hi, We have fixed this download and install the latest version from your account