gistfile1.txt

    df["last_horizon"] = df["last_horizon"].astype(int)
  File "/Users/victor.d/Projects/supply-planning-service/.venv/lib/python3.8/site-packages/pandas/core/generic.py", line 6240, in astype
    new_data = self._mgr.astype(dtype=dtype, copy=copy, errors=errors)
  File "/Users/victor.d/Projects/supply-planning-service/.venv/lib/python3.8/site-packages/pandas/core/internals/managers.py", line 448, in astype
    return self.apply("astype", dtype=dtype, copy=copy, errors=errors)
  File "/Users/victor.d/Projects/supply-planning-service/.venv/lib/python3.8/site-packages/pandas/core/internals/managers.py", line 352, in apply
    applied = getattr(b, f)(**kwargs)
  File "/Users/victor.d/Projects/supply-planning-service/.venv/lib/python3.8/site-packages/pandas/core/internals/blocks.py", line 526, in astype
    new_values = astype_array_safe(values, dtype, copy=copy, errors=errors)
  File "/Users/victor.d/Projects/supply-planning-service/.venv/lib/python3.8/site-packages/pandas/core/dtypes/astype.py", line 299, in astype_array_safe
    new_values = astype_array(values, dtype, copy=copy)
  File "/Users/victor.d/Projects/supply-planning-service/.venv/lib/python3.8/site-packages/pandas/core/dtypes/astype.py", line 230, in astype_array
    values = astype_nansafe(values, dtype, copy=copy)
  File "/Users/victor.d/Projects/supply-planning-service/.venv/lib/python3.8/site-packages/pandas/core/dtypes/astype.py", line 170, in astype_nansafe
    return arr.astype(dtype, copy=True)
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'