local variable 'timestamp_save_path' referenced before assignment

[geftactics]

I'm seeing the following error in my logs:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 278, in async_update_ha_state
    await self.async_device_update()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 474, in async_device_update
    raise exc
  File "/usr/src/homeassistant/homeassistant/components/image_processing/__init__.py", line 132, in async_update
    await self.async_process_image(image.content)
  File "/usr/src/homeassistant/homeassistant/components/image_processing/__init__.py", line 112, in async_process_image
    return await self.hass.async_add_executor_job(self.process_image, image)
  File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/config/custom_components/amazon_rekognition/image_processing.py", line 413, in process_image
    saved_image_path = self.save_image(
  File "/config/custom_components/amazon_rekognition/image_processing.py", line 539, in save_image
    return str(timestamp_save_path)
UnboundLocalError: local variable 'timestamp_save_path' referenced before assignment

I'm not setting the save_timestamped_file value in my config - As it should default to False if that has any bearing?