Issue with step 4: register_segmented.py, TypeError occurs

[youngwoo1]

Hi, I found some error at register_segmented.py

100%|██████████████████████████████████████████████████████████████████████████████████████| 42/42 [00:15<00:00, 2.68it/s]
Apply post processing
100%|██████████████████████████████████████████████████████████████████████████████████████| 33/33 [00:00<00:00, 58.07it/s]

Traceback (most recent call last):

File "/home/youngwoo/ObjectDatasetTools/register_segmented.py", line 243, in
plane_norm = normalize(np.array(plane_equation[:3]))
TypeError: 'NoneType' object has no attribute 'getitem'

I got this error after processing.
Could you please help me with this error?
Thank you!