WP Multisite Error

I’m getting the following error on any page that contains the Sendpress shortcode

NOTICE: wp-content/plugins/sendpress/classes/sc/class-sendpress-sc-forms.php:360 – Undefined variable: _collect_custom_field
require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), include(‘/themes/Divi/page.php’), the_content, apply_filters(‘the_content’), do_shortcode, preg_replace_callback, do_shortcode_tag, ET_Builder_Element->_shortcode_callback, ET_Builder_Section->shortcode_callback, do_shortcode, preg_replace_callback, do_shortcode_tag, ET_Builder_Element->_shortcode_callback, ET_Builder_Row->shortcode_callback, do_shortcode, preg_replace_callback, do_shortcode_tag, ET_Builder_Element->_shortcode_callback, ET_Builder_Column->shortcode_callback, do_shortcode, preg_replace_callback, do_shortcode_tag, ET_Builder_Element->_shortcode_callback, do_shortcode, preg_replace_callback, do_shortcode_tag, SendPress_Shortcode_Loader::forms, SendPress_Shortcode_Loader::shortcode_wrapper, SendPress_SC_Forms::output, SendPress_SC_Forms::signup

This was taken from the WP Debug Bar and I’m running Divi theme 3.0.24