site broken with the MStore API plugin

– https://wordpress.org/plugins/mstore-api/ and https://codecanyon.net/item/woocommerce-abandoned-cart-recovery/24089125

Fatal error: Uncaught Error: Call to a member function get() on null in /html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/execute/get-fb-email.php:47 Stack trace: #0 /html/wp-includes/class-wp-hook.php(287): WACVPIncExecuteGet_FB_Email->frontend_enqueue() #1 /html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters() #2 /html/wp-includes/plugin.php(484): WP_Hook->do_action() #3 /html/wp-includes/script-loader.php(2004): do_action() #4 /html/wp-includes/class-wp-hook.php(287): wp_enqueue_scripts() #5 /html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters() #6 /html/wp-includes/plugin.php(484): WP_Hook->do_action() #7 /html/wp-includes/general-template.php(3005): do_action() #8 /h in /html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/execute/get-fb-email.php on line 47