PHP Error

PHP Notice: user_id was called incorrectly. Order properties should not be accessed directly. Backtrace: require(‘wp-blog-header.php’), wp, WP->main, WP->parse_request, do_action_ref_array(‘parse_request’), WP_Hook->do_action, WP_Hook->apply_filters, WC_API->handle_api_requests, do_action(‘woocommerce_api_wc_gateway_coinpayments’), WP_Hook->do_action, WP_Hook->apply_filters, WC_Gateway_Coinpayments->check_ipn_response, WC_Gateway_Coinpayments->successful_request, WC_Order->payment_complete, WC_Order->save, WC_Order->status_transition, do_action(‘woocommerce_order_status_completed’), WP_Hook->do_action, WP_Hook->apply_filters, change_role_on_purchase, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong Please see Debugging in WordPress for more information. (This message was added in version 3.0.) in /home/admin/domains/mydomain.io/public_html/wp-includes/functions.php on line 5167