Fatal error and fix – Uncaught Error: Call to a member function query() on null

On update site crashes fatally. It is due to the method checkRemoveExpiredContacts() within class formsCfs (/plugins/contact-form-by-supsystic/modules/forms/mod.php) which refers to the object $wpdb, which is NULL. Seems like a scope issue.

I’ve set up a quick fix locally, but can this be looked into in the next release?

PHP version: 7.2.24

Complete error message:

An error of type E_ERROR was caused in line 193 in the file  /srv/www/www.langsethadvokat.no/public/wp-content/plugins/contact-form-by-supsystic/modules/forms/mod.php. Error message: Uncaught Error: Call to a member function query() on null in /srv/www/www.langsethadvokat.no/public/wp-content/plugins/contact-form-by-supsystic/modules/forms/mod.php:193
Stack trace:
#0 /srv/www/www.langsethadvokat.no/public/wp-includes/class-wp-hook.php(292): formsCfs->checkRemoveExpiredContacts('')
#1 /srv/www/www.langsethadvokat.no/public/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array)
#2 /srv/www/www.langsethadvokat.no/public/wp-includes/plugin.php(484): WP_Hook->do_action(Array)
#3 /srv/www/www.langsethadvokat.no/public/wp-settings.php(582): do_action('wp_loaded')
#4 /srv/www/www.langsethadvokat.no/public/wp-config.php(93): require_once('/srv/www/www.la...')
#5 /srv/www/www.langsethadvokat.no/public/wp-load.php(37): require_once('/srv/www/www.la...')
#6 /srv/www/www.langsethadvokat.no/public/wp-login.php(12): require('/srv/www/www.la...')
#7 {main}
  thrown