crated a new document, save doesn't work

Creating a new document and trying to save it doesn't work as expected. I get the yellow bar saying the file has been deleted.

Steps to reproduce:
1. Open scratch
2. Select New Document in the welcome screen.
3. Type something.
4. Click on "Save" button
5. Give a name to the file
6. When you acept you'll see the yellow information bar telling that the file has been deleted and nothing gets saved.

If you create an empty file first and then replace it, everything work as expected, so I'm guessing an error in the logic of checking if the file exists.

Cheers!

Ramiro.