Button Add-On Page on the IP Interface results in an error message

[CV-Private]

Hello Bepacom!

The button "Add-On Page" on the IP Interface results in an error message:

I've seen it with previous versions and it's also happening in 1.4.1b9.

Best regards,
Christian

[Bepacom-Raalte]

Hello, could you try it in 1.4.9b10?

Also, reminder that this repository is for the integration, not the add-on.

[CV-Private]

No change in 1.4.9b10 - I'm getting the same error message...

[GravySeal]

It's strange, as through javascript the the "ingress" should be transformed into "addon".
I've tested this in Firefox and Chromium, so I don't think it's a browser issue.
Do you access your Home Assistant instance locally or remotely?