TypeError: argument of type 'NoneType' is not iterable

[todokku]

C:\Users\Administrator\Desktop\New folder (6)>twitch_utils record dodgeballcanada -j 2 -b 2M
Checking if channel dodgeballcanada is active...
Stream is online! Found the ID of live VOD: 534927868
Starting to record the live stream...
Downloading https://twitch.tv/dodgeballcanada into 534927868.end.ts
Process Process-1:
Traceback (most recent call last):
File "e:\users\administrator\appdata\local\programs\python\python36\lib\multiprocessing\process.py", line 258, in _bootstrap
self.run()
File "e:\users\administrator\appdata\local\programs\python\python36\lib\multiprocessing\process.py", line 93, in run
self._target(*self._args, **self._kwargs)
File "e:\users\administrator\appdata\local\programs\python\python36\lib\site-packages\twitch_utils\record.py", line 57, in download
sl_proc = Popen(sl_cmd, **sl_kwargs)
File "e:\users\administrator\appdata\local\programs\python\python36\lib\subprocess.py", line 729, in init
restore_signals, start_new_session)
File "e:\users\administrator\appdata\local\programs\python\python36\lib\subprocess.py", line 991, in _execute_child
args = list2cmdline(args)
File "e:\users\administrator\appdata\local\programs\python\python36\lib\subprocess.py", line 481, in list2cmdline
needquote = (" " in arg) or ("\t" in arg) or not arg
TypeError: argument of type 'NoneType' is not iterable

[Дмитрий Карих]

This should fix it. However I'm not sure about -b flag on Windows. It may work if you have pv utility, but I haven't tested it yet.