Property Order-> Carrier id is Empty error when manually adding an order

[Dolfijn]

I just stumbled on the error "Property Order-> Carrier id is Empty" when trying to create a manual order. Trying again generates the same message. The order is also not created. What I did to circumvent the problem was using the link to the front office to finalize the order process as the customer would. That worked well. But I think this kind of problems in the order process should not happen.

I checked the table ps-order for the carrier-id in the order record that in the end succeeded. And, of course, this carrier-id also exist in the table ps_carriers. The text associate with this carrier-id also was shown in the BO when I tried to add the order manual in the first place (which ended with the error message).

To be clear, the error thus only appears when using the create button. Using the link to the FO works fine. I'm running bleeding edge.

What to do now?