Fatal error after update version 2.1.6.6

Hi,
After the update, the extension has created a fatal error when we want to display customer orders:

Fatal Error :
Fatal error: Uncaught Error: Call to undefined function check() in /home/clients/7fad95ec73d8613aa85de1b95bdd4d09/web/wp-content/plugins/woocommerce-multi-currency/admin/order.php:92 Stack trace: #0 /home/clients/7fad95ec73d8613aa85de1b95bdd4d09/web/wp-admin/includes/template.php(1304): WOOMULTI_CURRENCY_Admin_Order->order_metabox(Object(WP_Post), Array) #1 /home/clients/7fad95ec73d8613aa85de1b95bdd4d09/web/wp-admin/edit-form-advanced.php(635): do_meta_boxes(Object(WP_Screen), ‘side’, Object(WP_Post)) #2 /home/clients/7fad95ec73d8613aa85de1b95bdd4d09/web/wp-admin/post.php(197): include(‘/home/clients/7…’) #3 {main} thrown in /home/clients/7fad95ec73d8613aa85de1b95bdd4d09/web/wp-content/plugins/woocommerce-multi-currency/admin/order.php on line 92
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please help me it’s urgent…