'NoneType' object is not subscriptable

Error occurred when executing PreviewImage:
'NoneType' object is not subscriptable

File "D:\ComfyUI_windows_portable\ComfyUI\execution.py", line 154, in recursive_execute
output_data, output_ui = get_output_data(obj, input_data_all)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "D:\ComfyUI_windows_portable\ComfyUI\execution.py", line 84, in get_output_data
return_values = map_node_over_list(obj, input_data_all, obj.FUNCTION, allow_interrupt=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "D:\ComfyUI_windows_portable\ComfyUI\execution.py", line 77, in map_node_over_list
results.append(getattr(obj, func)(**slice_dict(input_data_all, i)))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "D:\ComfyUI_windows_portable\ComfyUI\nodes.py", line 1415, in save_images
full_output_folder, filename, counter, subfolder, filename_prefix = folder_paths.get_save_image_path(filename_prefix, self.output_dir, images[0].shape[1], images[0].shape[0])
~~~~~~^^^

hi there i get this error from this workflow:
[workflow.json](https://github.com/comfyanonymous/ComfyUI/files/13917762/workflow.json)

workflow is from: https://www.reddit.com/r/comfyui/comments/17qec73/sillytavern_character_expression_workflow/
there is tutorial there on how to use

i using windows, rtx 3090, i7
if there is anything more i need to supply just ask
thank you for your help :)