While testing the example-tornado project, clicking the disconnect button results in a 500 error.

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Expected behaviour

While testing the example-tornado project in the python-social-auth/social-examples project, I'm getting as far as social login, but when I click the disconnect button, I get a 500 error.

Actual behaviour

The disconnect button should work properly after social login.

What are the steps to reproduce this issue?

You can clone the python-social-auth/social-examples project and set up a random provider in the example-tornado project and proceed with the social connection.

Any logs, error output, etc?

When I click the logout button, I get an error message in the console and a 500 error in the web browser.

Any other comments?

I'm working on changing the SQLAlchemy 1 version code to SQLAlchemy 2 version code in several subprojects of the Python-social-auth project, and I'd like to reflect this in the corresponding commits.