Hi there,
To clarify, does that happen as soon as you open the Edit Order screen? Or after you perform some action?
I see that your order is under a Guest user.
Testing on my site, for an order under a guest user, if I try to edit the Billing or Shipping address and click the “Load billing/shipping address” link, then it shows that “No customer selected” popup (which makes sense since there is no user/customer to load it from — it’s a guest).
However, if you are seeing it as soon as the page loads, that would be unexpected. If that’s the case, then please share a copy of your site’s System Status. You can find it via WooCommerce > Status. Select “Get system report” and then “Copy for support”. Once you’ve done that, you can paste it here in your reply. Please note that since this is a public forum, you may want to remove any sensitive information that you don’t want shared publicly.
