Кто знает причину ошибки?

Версия Django "2.0.7".
Версия Python "3.6.4".
С запуском нового проекта в PyCharm консоль начала выставлять на показ такое вот безобразие:

File "D:\eg\venv\lib\site-packages\django\core\servers\basehttp.py", line 86, in handle_error
    super().handle_error()
  File "C:\Users\compucter\AppData\Local\Programs\Python\Python36-32\lib\wsgiref\handlers.py", line 368, in handle_error
    self.finish_response()
  File "C:\Users\compucter\AppData\Local\Programs\Python\Python36-32\lib\wsgiref\handlers.py", line 180, in finish_response
    self.write(data)
  File "C:\Users\compucter\AppData\Local\Programs\Python\Python36-32\lib\wsgiref\handlers.py", line 274, in write
    self.send_headers()
  File "C:\Users\compucter\AppData\Local\Programs\Python\Python36-32\lib\wsgiref\handlers.py", line 331, in send_headers
    if not self.origin_server or self.client_is_modern():
  File "C:\Users\compucter\AppData\Local\Programs\Python\Python36-32\lib\wsgiref\handlers.py", line 344, in client_is_modern
    return self.environ['SERVER_PROTOCOL'].upper() != 'HTTP/0.9'
TypeError: 'NoneType' object is not subscriptable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\compucter\AppData\Local\Programs\Python\Python36-32\lib\socketserver.py", line 639, in process_request_thread
    self.finish_request(request, client_address)
  File "C:\Users\compucter\AppData\Local\Programs\Python\Python36-32\lib\socketserver.py", line 361, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "C:\Users\compucter\AppData\Local\Programs\Python\Python36-32\lib\socketserver.py", line 696, in __init__
    self.handle()
  File "D:\eg\venv\lib\site-packages\django\core\servers\basehttp.py", line 154, in handle
    handler.run(self.server.get_app())
  File "C:\Users\compucter\AppData\Local\Programs\Python\Python36-32\lib\wsgiref\handlers.py", line 144, in run
    self.close()
  File "C:\Users\compucter\AppData\Local\Programs\Python\Python36-32\lib\wsgiref\simple_server.py", line 35, in close
    self.status.split(' ',1)[0], self.bytes_sent
AttributeError: 'NoneType' object has no attribute 'split'

Кто знает в чём причина? Сам сайт работает прекрасно.

UPD. Обновил Python до '3.7.0' - ошибка не исчезла.