"Save As..." throws an error

Steps to reproduce:

1. Create and open any graph asset
2. Click the dropdown next to the save button and select "Save As..."
3. Give it a name and save it

Actual results: The new asset is created but a null reference error is thrown in the console

Expected results: The new asset is created and no error is thrown in the console

Reproducible with versions: 0.4.0

Tested on (OS): MacOS