[API] Auth login error

[SchrodingersGat]

This error was caught on sentry.io

A GET request to /api/user/token/ resulted in a 500 status, and threw the following errors:

ValueError: You have multiple authentication backends configured and therefore must provide the `backend` argument or set the `backend` attribute on the user.

AttributeError: 'User' object has no attribute 'backend'

The trace points to this line of code:

InvenTree/src/backend/InvenTree/users/api.py

Line 266 in 3ff5078

login(request, user)

[SchrodingersGat]

@matmair I am assuming this is related to the recent auth API refactor - can you please take a look?

[matmair]

I have an idea for a quick fix but the clean solution would be to remove the calls to /token completely - we do not need them for the frontend anymore.

Is there any more context provided in sentry? I can not reproduce this reliably in my dev environment.