IsADirectoryError: [Errno 21] Is a directory:

[yankinmax]

Hi.
I try to crawl the page (http://en.zkteco.com) with your cloner, but I can't prevent this error:

Traceback (most recent call last):
File "website_cloner.py", line 143, in
crawl(site_name + "/")
File "website_cloner.py", line 132, in crawl
save_assets(r.text)
File "website_cloner.py", line 93, in save_assets
with open(project_path + file_name.split("/?")[0], "wb") as f:
IsADirectoryError: [Errno 21] Is a directory: '../mySite'

I use Python 3.5 on Ubuntu 16.04 Desktop.
I made virtualenv and all requirements were installed without any issues.
I have found that this error happened because of this Google redirect content
(//googleads.g.doubleclick.net/pagead/viewthroughconversion/953570153/?value=0&guid=ON&script=0).
With handling of Exception it works, but I still cannot open cloned website localy.
Could you try it yourself and help me please?