Rama z-score failed  failed.

/net/marbles/raid1/dorothee/rerefine/cryoem/data_no_H/8k0q_36777/07_2024/8k0q_36777.cif /net/marbles/raid1/dorothee/rerefine/cryoem/data_no_H/8k0q_36777/07_2024/8k0q_36777.map 3.14
Traceback (most recent call last):
  File "/net/marbles/raid1/dorothee/rerefine/cryoem/rerefine_script.py", line 420, in get_statistics
    self.json_data[p+'z_score'] = z_scores['W'][0]
TypeError: 'NoneType' object has no attribute '__getitem__'