On bleeding edge: "This address is not yours"

[veganline]

I made a test order on a bleeding edge update and had an error message prevent it: 'This address is not yours'

from
 https://github.com/thirtybees/thirtybees/blob/e84fd0b4bc4adf1600cac135e1d5c42f75cefb60/controllers/front/OrderOpcController.php#L226

which reads

if ($addressDelivery->id_customer != $this->context->customer->id || $addressInvoice->id_customer != $this->context->customer->id) { $this->errors[] = Tools::displayError('This address is not yours.');

Does anybody know what this check is trying to do, or a way of turning it off from the back office without over-rides?
I try to cut-out everything to do with customer registration and keep all customers as guests who can order from any address.

This isn't urgent but ideas are welcome