python pwb.py commonscat -site:wikiquote:ar -page:"الاستبداد"

Script terminated by exception:

ERROR: InvalidTitleError: 'Category:' has no title.
Traceback (most recent call last):
  File "C:\Users\Mohammed\Downloads\core\pwb.py", line 365, in <module>
    if not main():
  File "C:\Users\Mohammed\Downloads\core\pwb.py", line 357, in main
    run_python_file(filename,
  File "C:\Users\Mohammed\Downloads\core\pwb.py", line 73, in run_python_file
    exec(compile(source, filename, 'exec', dont_inherit=True),
  File ".\scripts\commonscat.py", line 552, in <module>
    main()
  File ".\scripts\commonscat.py", line 546, in main
    bot.run()
  File "C:\Users\Mohammed\Downloads\core\pywikibot\bot.py", line 1533, in run
    self.treat(page)
  File "C:\Users\Mohammed\Downloads\core\pywikibot\bot.py", line 1814, in treat
    self.treat_page()
  File ".\scripts\commonscat.py", line 318, in treat_page
    commonscatLink = self.find_commons_category(page)
  File ".\scripts\commonscat.py", line 412, in find_commons_category
    return self.findCommonscatLink(page)
  File ".\scripts\commonscat.py", line 385, in findCommonscatLink
    checkedCommonscat = self.checkCommonscatLink(commonscatLink[1])
  File ".\scripts\commonscat.py", line 454, in checkCommonscatLink
    if not commonsPage.exists():
  File "C:\Users\Mohammed\Downloads\core\pywikibot\page\__init__.py", line 710, in exists
    return self.pageid > 0
  File "C:\Users\Mohammed\Downloads\core\pywikibot\page\__init__.py", line 258, in pageid
    self.site.loadpageinfo(self)
  File "C:\Users\Mohammed\Downloads\core\pywikibot\page\__init__.py", line 195, in site
    return self._link.site
  File "C:\Users\Mohammed\Downloads\core\pywikibot\page\__init__.py", line 5382, in site
    self.parse()
  File "C:\Users\Mohammed\Downloads\core\pywikibot\page\__init__.py", line 5278, in parse
    raise InvalidTitleError(
pywikibot.exceptions.InvalidTitleError: 'Category:' has no title.
CRITICAL: Exiting due to uncaught exception <class 'pywikibot.exceptions.InvalidTitleError'>

Pywikibot: [https] r-pywikibot-core (f60f6f3, g14825, 2021/05/12, 07:52:57, master)
Release version: 6.2.0.dev0
requests version: 2.25.1
    certificate test: ok
Python: 3.9.5 (tags/v3.9.5:0a7dcbd, May  3 2021, 17:27:52) [MSC v.1928 64 bit (AMD64)]