[Bug]: App crash when clicking on create new "Sold Appliance" button

[beesaferoot]

Preflight Checklist

• I have read the Contributing Guidelines for this project, if it exists.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Expected Behavior

The Agent app should open the new sold appliance view without crashing.

Actual Behavior

Crashed with error traceback below

Steps to reproduce

1. Go to Customer list view
2. Click on customer detail
3. Click on "Appliance" section on bottom pane
4. Click on new button

What operating system(s) are you using?

macOS

Additional Information

No response