Error when closing the web interface

[renanrodrigo]

If I'm working with the web interface and then close the browser window, the following error is shown in kytos:

Traceback (most recent call last):
  File "/home/renan/testes/asd/lib/python3.6/site-packages/werkzeug/serving.py", line 209, in run_wsgi
    execute(self.server.app)
  File "/home/renan/testes/asd/lib/python3.6/site-packages/werkzeug/serving.py", line 197, in execute
    application_iter = app(environ, start_response)
  File "/home/renan/testes/asd/lib/python3.6/site-packages/flask/app.py", line 1997, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/renan/testes/asd/lib/python3.6/site-packages/flask_socketio/__init__.py", line 42, in __call__
    start_response)
  File "/home/renan/testes/asd/lib/python3.6/site-packages/engineio/middleware.py", line 47, in __call__
    return self.engineio_app.handle_request(environ, start_response)
  File "/home/renan/testes/asd/lib/python3.6/site-packages/socketio/server.py", line 353, in handle_request
    return self.eio.handle_request(environ, start_response)
  File "/home/renan/testes/asd/lib/python3.6/site-packages/engineio/server.py", line 268, in handle_request
    self.disconnect(sid)
  File "/home/renan/testes/asd/lib/python3.6/site-packages/engineio/server.py", line 202, in disconnect
    self._get_socket(sid).close()
  File "/home/renan/testes/asd/lib/python3.6/site-packages/engineio/server.py", line 411, in _get_socket
    raise KeyError('Session is disconnected')
KeyError: 'Session is disconnected'