Token-related TypeError

[Frostbyte0x70]

I don't have a proper dev environment set up and the documentation for Requests-OAuthlib is pretty lacking, so I'll just dump the stacktrace here in case I ever feel like looking into this.

TypeError: Expected bytes, unicode, or None; got <class 'oauthlib.oauth2.rfc6749.tokens.OAuth2Token'>

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/requests_oauthlib/oauth2_session.py", line 528, in request
    url, headers, data = self._client.add_token(
  File "/usr/local/lib/python3.9/site-packages/oauthlib/oauth2/rfc6749/clients/base.py", line 217, in add_token
    raise TokenExpiredError()
oauthlib.oauth2.rfc6749.errors.TokenExpiredError: (token_expired) 

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/app/swablu/web.py", line 94, in get
    if await self.auth(self._allow_auth_without_hacks):
  File "/app/swablu/web.py", line 166, in auth
    user = discord.get(API_BASE_URL + '/users/@me').json()
  File "/usr/local/lib/python3.9/site-packages/requests/sessions.py", line 602, in get
    return self.request("GET", url, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/requests_oauthlib/oauth2_session.py", line 554, in request
    self.token_updater(token)
  File "/app/swablu/web.py", line 113, in token_updater
    self.set_cookie('oauth2_token', token)
  File "/usr/local/lib/python3.9/site-packages/tornado/web.py", line 635, in set_cookie
    value = escape.native_str(value)
  File "/usr/local/lib/python3.9/site-packages/tornado/escape.py", line 228, in to_unicode
    raise TypeError("Expected bytes, unicode, or None; got %r" % type(value))
TypeError: Expected bytes, unicode, or None; got <class 'oauthlib.oauth2.rfc6749.tokens.OAuth2Token'>