Error when downloading final package with ThridParty = True

[gallypette]

2020-08-21 08:11:46,447 - WARNING - New Sensor created, uuid:c135c5aa-b25f-43b2-aac1-132242c450b0, ip
:xx.xx.xx.xx, type:1, destination:default, client:go, os:linux, arch:amd64                          
2020-08-21 08:11:46,749 - ERROR - Exception on /download [GET]                                       
Traceback (most recent call last):                                                                   
  File "/home/d4/d4-sensor-generator/D4GENV/lib/python3.6/site-packages/flask/app.py", line 2446, in 
wsgi_app                                                                                             
    response = self.full_dispatch_request()                                                          
  File "/home/d4/d4-sensor-generator/D4GENV/lib/python3.6/site-packages/flask/app.py", line 1951, in 
full_dispatch_request                                                                                
    rv = self.handle_user_exception(e)                                                               
  File "/home/d4/d4-sensor-generator/D4GENV/lib/python3.6/site-packages/flask/app.py", line 1820, in 
handle_user_exception                                                                                
    reraise(exc_type, exc_value, tb)                                                                 
  File "/home/d4/d4-sensor-generator/D4GENV/lib/python3.6/site-packages/flask/_compat.py", line 39, i
n reraise                                                                                            
    raise value                                                                                      
  File "/home/d4/d4-sensor-generator/D4GENV/lib/python3.6/site-packages/flask/app.py", line 1949, in 
full_dispatch_request                                                                                
    rv = self.dispatch_request()                                                                     
  File "/home/d4/d4-sensor-generator/D4GENV/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/d4/d4-sensor-generator/blueprints/root.py", line 438, in download
    registred = register_sensor_via_api(UUID, key, mail, third_party=third_party)
  File "/home/d4/d4-sensor-generator/blueprints/root.py", line 123, in register_sensor_via_api
    root_log.error(res.json())
  File "/home/d4/d4-sensor-generator/D4GENV/lib/python3.6/site-packages/requests/models.py", line 897, in json
    return complexjson.loads(self.text, **kwargs)
  File "/usr/lib/python3.6/json/__init__.py", line 354, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.6/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.6/json/decoder.py", line 357, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
2020-08-21 08:11:46,750 - INFO - xx.xx.xx.xx - - [21/Aug/2020 08:11:46] "GET /download?d4_client=go&
type=1&destination=default&os=linux&arch=amd64&third_party=True HTTP/1.1" 500 -