Can't download articles due to TypeError: int() argument must be a string, a bytes-like object or a real number, not 'NoneType'

[bashar-araiqat]

Connected to: https://api.openaccessbutton.org/find
Do you want to download:
High Prevalence of Pericardial Involvement in College Student Athletes Recovering From COVID-19.pdf [y/N]: y
Traceback (most recent call last):
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 196, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 86, in run_code
exec(code, run_globals)
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\Scripts\bookcut.exe_main.py", line 7, in
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\site-packages\click\core.py", line 1130, in call
return self.main(*args, **kwargs)
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\site-packages\click\core.py", line 1055, in main
rv = self.invoke(ctx)
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\site-packages\click\core.py", line 1657, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\site-packages\click\core.py", line 1404, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\site-packages\click\core.py", line 760, in invoke
return __callback(*args, **kwargs)
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\site-packages\bookcut\bookcut.py", line 188, in article
article_search(doi, title)
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\site-packages\bookcut\article.py", line 20, in article_search
ask_for_downloading(filename, url)
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\site-packages\bookcut\article.py", line 28, in ask_for_downloading
search_downloader(articlefilename, url)
File "C:\Users\kingb\AppData\Local\Programs\Python\Python310\lib\site-packages\bookcut\search.py", line 17, in search_downloader
total_size = int(response.headers.get("content-length"))
TypeError: int() argument must be a string, a bytes-like object or a real number, not 'NoneType'