Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Getting StopIteration: 'NoneType' object is not subscriptable

See original GitHub issue

count 	[44][5]
loss: 	[44][57.3060036]
loss: 	[44][173.999207]
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/keras/utils/data_utils.py", line 578, in get
    inputs = self.queue.get(block=True).get()
  File "/usr/lib/python3.6/multiprocessing/pool.py", line 644, in get
    raise self._value
  File "/usr/lib/python3.6/multiprocessing/pool.py", line 119, in worker
    result = (True, func(*args, **kwds))
  File "/usr/local/lib/python3.6/dist-packages/keras/utils/data_utils.py", line 401, in get_index
    return _SHARED_SEQUENCES[uid][i]
  File "/content/drive/keras-yolo3/generator.py", line 73, in __getitem__
    img, all_objs = self._aug_image(train_instance, net_h, net_w)
  File "/content/drive/keras-yolo3/generator.py", line 160, in _aug_image
    image = cv2.imread(image_name)[:,:,::-1] # RGB image
TypeError: 'NoneType' object is not subscriptable

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "train.py", line 251, in <module>
    _main_(args)
  File "train.py", line 210, in _main_
    max_queue_size   = 4
  File "/usr/local/lib/python3.6/dist-packages/keras/legacy/interfaces.py", line 91, in wrapper
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/keras/engine/training.py", line 2192, in fit_generator
    generator_output = next(output_generator)
  File "/usr/local/lib/python3.6/dist-packages/keras/utils/data_utils.py", line 584, in get
    six.raise_from(StopIteration(e), e)
  File "<string>", line 3, in raise_from
StopIteration: 'NoneType' object is not subscriptable