gistfile1.txt

[E 2017-07-23 08:02:29.020 JupyterHub web:1025] Failed to flush partial response
    Traceback (most recent call last):
      File "/srv/venv/site-packages/tornado/web.py", line 1022, in send_error
        self.finish()
      File "/srv/venv/site-packages/jupyterhub/handlers/base.py", line 98, in finish
        super().finish(*args, **kwargs)
      File "/srv/venv/site-packages/tornado/web.py", line 993, in finish
        self._log()
      File "/srv/venv/site-packages/tornado/web.py", line 1540, in _log
        self.application.log_request(self)
      File "/srv/venv/site-packages/tornado/web.py", line 2053, in log_request
        self.settings["log_function"](handler)
      File "/srv/venv/site-packages/jupyterhub/log.py", line 90, in log_request
        user = handler.get_current_user()
      File "/srv/venv/site-packages/jupyterhub/handlers/base.py", line 219, in get_current_user
        user = self.get_current_user_token()
      File "/srv/venv/site-packages/jupyterhub/handlers/base.py", line 177, in get_current_user_token
        orm_token = orm.APIToken.find(self.db, token)
      File "/srv/venv/site-packages/jupyterhub/orm.py", line 363, in find
        for orm_token in prefix_match:
      File "/srv/venv/site-packages/sqlalchemy/orm/query.py", line 2854, in __iter__
        self.session._autoflush()
      File "/srv/venv/site-packages/sqlalchemy/orm/session.py", line 1397, in _autoflush
        self.flush()
      File "/srv/venv/site-packages/sqlalchemy/orm/session.py", line 2171, in flush
        self._flush(objects)
      File "/srv/venv/site-packages/sqlalchemy/orm/session.py", line 2235, in _flush
        assert _reg, "Failed to add object to the flush context!"
    AssertionError: Failed to add object to the flush context!