Chapter 15(
actually the 16th chapter) of that story has so many nested <span> tags(500+) that the recursive HTML parsing used by the bs4 library exceeds python's maximum recursion depth and (apparently) crashes the background download process.
This is something we've seen a
few times before. But not often enough to try and come up with a solution that isn't worse than the problem.
I don't know why the recursion error isn't being caught and reported--pretty sure it used to be. I will be looking into that.
You can download all the other chapters by using chapter ranges to download it in two parts, [1-15] and [17-], or exclude that chapter with
ignore_chapter_url_list.