This Site is Experiencing Technical Difficulties

Hey there,

I’ve been receiving multiple notifications from wordpress via email for the past few days that there is a technical problem on my site. The cause seems to be this plugin. I think it started around the time I updated to the last version, but I’m not sure.

Fehler-Details
==============
Ein Fehler vom Typ E_ERROR wurde in der Zeile 579 der Datei /usr/www/users/xxx/yyy/wp-content/plugins/woo-min-max-quantity-step-control-single/includes/min-max-controller.php verursacht. Fehlermeldung: Uncaught TypeError: method_exists(): Argument #1 ($object_or_class) must be of type object|string, bool given in /usr/www/users/xxx/yyy/wp-content/plugins/woo-min-max-quantity-step-control-single/includes/min-max-controller.php:579
Stack trace:
#0 /usr/www/users/xxx/yyy/wp-content/plugins/woo-min-max-quantity-step-control-single/includes/min-max-controller.php(579): method_exists()
#1 /usr/www/users/xxx/yyy/wp-includes/class-wp-hook.php(310): WC_MMQ\Includes\Min_Max_Controller->quantity_input_step()
#2 /usr/www/users/xxx/yyy/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#3 /usr/www/users/xxx/yyy/wp-content/plugins/woocommerce/includes/admin/meta-boxes/views/html-order-item.php(70): apply_filters()
#4 /usr/www/users/xxx/yyy/wp-content/plugins/woocommerce/includes/admin/meta-boxes/views/html-order-items.php(73): include('/usr/www/users/...')
#5 /usr/www/users/xxx/yyy/wp-content/plugins/woocommerce/includes/admin/meta-boxes/class-wc-meta-box-order-items.php(40): include('/usr/www/users/...')
#6 /usr/www/users/xxx/yyy/wp-admin/includes/template.php(1443): WC_Meta_Box_Order_Items::output()
#7 /usr/www/users/xxx/yyy/wp-admin/edit-form-advanced.php(688): do_meta_boxes()
#8 /usr/www/users/xxx/yyy/wp-admin/post.php(206): require('/usr/www/users/...')
#9 {main}
  thrown

It would be nice if someone could take a look into this.

Cheers

The page I need help with: [log in to see the link]