Cannot Save (Done) after adding Headers

[hvdort]

Which node are you reporting an issue on?

oauth2

What are the steps to reproduce?

Add Header

What happens?

Nothing if I press "Done". At the moment I remove the header(s), it works again.

Looking in the javascript console, I see an error "object: code not found" and a second "TypeError: Converting circular structure".

What do you expect to happen?

Accept the given headers

Please tell us about your environment:

• [ ] Node-RED version: 4.0.3 inside HomeAssistant
• [ ] node.js version: most recent stable. Don't know the version
• [ ] npm version: don't know. Latest version of AddOn in HomeAssistant
• [ ] Platform/OS: Linux
• [ ] Browser: Edge/Chromium