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<class 'TypeError'>: int() argument must be a string, a bytes-like object or a number, not 'NoneType'

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/views/generic/base.py", line 98, in dispatch
    return handler(request, *args, **kwargs)
  File "/zebragui/zebragui/views/generated.py", line 23, in get
    DEFAULT_DIET = int(lib.get_config("defaults.codebooks.diet"))
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'