Error downloading a playlist from lynda.com because one video has no subtitle.

[haddadwael]

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When I am downloading a playlist from Lynda.com, I use the following command to download all the videos with the subtitles:

youtube-dl --cookies cookies.txt "Course Link" -o "%(playlist)s/%(chapter_number)s - %(chapter)s/%(playlist_index)s - %(title)s.%(ext)s" --write-sub

It works fine until it reach one of the videos with no subtitle then it shows the following error:
ERROR: None: Failed to parse JSON (caused by ValueError('Expecting property nam
e enclosed in double quotes: line 1 column 3 (char 2)',)); please report this is
sue on https://yt-dl.org/bug . Make sure you are using the latest version; type
youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag an
d include its complete output.

My question is if there any way or a command to download a course with all the available subtitles even if there is one of the video has no subtitle?

Thank you