I’m having the same problem when I try to add a new order
Fatal error: Uncaught Error: Call to a member function get_payment_method() on boolean in /home/wbxracks/public_html/wp-content/plugins/woocommerce/includes/admin/meta-boxes/class-wc-meta-box-order-data.php:156 Stack trace: #0 /home/wbxracks/public_html/wp-admin/includes/template.php(1306): WC_Meta_Box_Order_Data::output(Object(stdClass), Array) #1 /home/wbxracks/public_html/wp-admin/edit-form-advanced.php(638): do_meta_boxes(Object(WP_Screen), ‘normal’, Object(stdClass)) #2 /home/wbxracks/public_html/wp-admin/post-new.php(75): include(‘/home/wbxracks/…’) #3 {main} thrown in /home/wbxracks/public_html/wp-content/plugins/woocommerce/includes/admin/meta-boxes/class-wc-meta-box-order-data.php on line 156