KeyError: 'Session is disconnected'

[vhoulbreque]

When loading a model for autopilot, there is always this error (captured so it does not break the code):

The model ./models/autopilot_500k.hdf5 has been successfully loaded
Error on request:
Traceback (most recent call last):
File "/home/pi/.local/lib/python3.5/site-packages/werkzeug/serving.py", line 270, in run_wsgi
execute(self.server.app)
File "/home/pi/.local/lib/python3.5/site-packages/werkzeug/serving.py", line 258, in execute
application_iter = app(environ, start_response)
File "/home/pi/.local/lib/python3.5/site-packages/flask/app.py", line 1997, in call
return self.wsgi_app(environ, start_response)
File "/home/pi/.local/lib/python3.5/site-packages/flask_socketio/init.py", line 43, in call
start_response)
File "/home/pi/.local/lib/python3.5/site-packages/engineio/middleware.py", line 47, in call
return self.engineio_app.handle_request(environ, start_response)
File "/home/pi/.local/lib/python3.5/site-packages/socketio/server.py", line 360, in handle_request
return self.eio.handle_request(environ, start_response)
File "/home/pi/.local/lib/python3.5/site-packages/engineio/server.py", line 290, in handle_request
socket = self._get_socket(sid)
File "/home/pi/.local/lib/python3.5/site-packages/engineio/server.py", line 421, in _get_socket
raise KeyError('Session is disconnected')
KeyError: 'Session is disconnected'