Error when trying to deactivate a plugin

When trying to deactivate the Modern Events Calendar plugin I am getting this strage error. Has anyone experienced it before?

Fatal error: Uncaught Error: Access to undeclared static property: MEC_Woocommerce\Base::$is_mec_active in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/mec-woocommerce/mec-woocommerce.php:208 Stack trace: #0 /var/www/vhosts/example.com/httpdocs/wp-content/plugins/mec-woocommerce/mec-woocommerce.php(442): MEC_Woocommerce\Base::checkPlugins() #1 /var/www/vhosts/example.com/httpdocs/wp-content/plugins/mec-woocommerce/mec-woocommerce.php(63): MEC_Woocommerce\Base->preLoad() #2 /var/www/vhosts/example.com/httpdocs/wp-content/plugins/mec-woocommerce/mec-woocommerce.php(50): MEC_Woocommerce\Base->__construct() #3 /var/www/vhosts/example.com/httpdocs/wp-content/plugins/mec-woocommerce/mec-woocommerce.php(451): MEC_Woocommerce\Base::instance() #4 /var/www/vhosts/example.com/httpdocs/wp-includes/class-wp-hook.php(287): MEC_Woocommerce\{closure}() #5 /var/www/vhosts/example.com/httpdocs/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters() #6 /var/www/vhosts/example.com/httpdocs/wp-i in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/mec-woocommerce/mec-woocommerce.php on line 208