FreeNAS

TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'
  File "django/core/handlers/exception.py", line 39, in inner
    response = get_response(request)
  File "django/core/handlers/base.py", line 249, in _legacy_get_response
    response = self._get_response(request)
  File "django/core/handlers/base.py", line 178, in _get_response
    response = middleware_method(request, callback, callback_args, callback_kwargs)
  File "freenasUI/freeadmin/middleware.py", line 162, in process_view
    return login_required(view_func)(request, *view_args, **view_kwargs)
  File "django/contrib/auth/decorators.py", line 23, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "freenasUI/storage/views.py", line 880, in volume_detach
    usedsize = humanize_size(usedbytes)
  File "freenasUI/common/__init__.py", line 64, in humanize_size
    return (__humanize_number_common(int(number), IEC_MAP))