Unable to add invoice

I'm not able to add an invoice.

Creating an invoice and then pressing 'Save' fails silently. Nothing changes and, when leaving the page, no invoice has been added to my list of invoices.

The javascript terminal returns an error:

Failed to load resource: the server responded with a status of 422 ()
https://app.akaunting.com/sales/invoices

Error: Request failed with status code 422
invoices.js: 39080

I had this same error until I realized that the "Item Name" is behaving differently than it did in v1.13. It's no longer purely free type, you now have to populate the item name and THEN click '+ Add New' (which will add it to the list of items to select from), or select an item for which you've previously done this for.

Once I worked this out, the error went away and the invoice created as expected.

Thanks. I also realised that, indeed. I'm not sure it's an improvement, though. :)