NoneType has no len() - not downloading about moodle-dl HOT 1 CLOSED

ERROR {main} Traceback (most recent call last):
File "/home/zorin/.local/lib/python3.8/site-packages/moodle_dl/main.py", line 536, in main
choose_task(config, opts)
File "/home/zorin/.local/lib/python3.8/site-packages/moodle_dl/main.py", line 68, in choose_task
run_main(config, opts)
File "/home/zorin/.local/lib/python3.8/site-packages/moodle_dl/main.py", line 136, in run_main
raise base_err
File "/home/zorin/.local/lib/python3.8/site-packages/moodle_dl/main.py", line 106, in run_main
downloader = DownloadService(changed_courses, config, opts, database)
File "/home/zorin/.local/lib/python3.8/site-packages/moodle_dl/downloader/download_service.py", line 24, in init
self.all_tasks = self.gen_all_tasks()
File "/home/zorin/.local/lib/python3.8/site-packages/moodle_dl/downloader/download_service.py", line 36, in gen_all_tasks
Task(
File "/home/zorin/.local/lib/python3.8/site-packages/moodle_dl/downloader/task.py", line 78, in init
self.filename = PT.to_valid_name(self.file.content_filename, is_file=True)
File "/home/zorin/.local/lib/python3.8/site-packages/moodle_dl/utils.py", line 449, in to_valid_name
name = PathTools.truncate_filename(name, is_file, max_length)
File "/home/zorin/.local/lib/python3.8/site-packages/moodle_dl/utils.py", line 460, in truncate_filename
ext_len = len(ext)
TypeError: object of type 'NoneType' has no len()

from moodle-dl.