Critical WP Error on Dashboard

Upon opening the Newsletter Dashboard in the Backend I get an Error (XXXX is some namespace\className from my used Theme):

Uncaught Error: Call to undefined method XXXX\XXXX\XXXX::get_send_speed() in /html/staging/wp-content/plugins/newsletter/main/index.php:30

Upon inspection of the main/index.php there is a call to $speed = $newsletter->get_send_speed(); without prior instanciation of the $newsletter variable.
Adding this line to the index.php fixes the Issue:

$newsletter = Newsletter::instance();

Would be great if you could add this Fix to the actual Plugin if possible 🙂


This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Buy WordPress Transfer