Code showing on invoices

  • When I receive a new customer order I can see code on the email proceeding the order details:

    The order is as follows:

    Notice: 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, WP_Hook->do_action, WP_Hook->apply_filters, …

    …includes/functions.php on line 4138
    Order #43…

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