**Command line:**
```
python pwb.py cosmetic_changes -page:"نقاش:ورق بردى" -lang:arz
```
**Output:**
```
ERROR: 'NoneType' object has no attribute 'groups' (AttributeError)
Traceback (most recent call last):
File "C:\Users\Mohammed\Downloads\core\pwb.py", line 39, in <module>
sys.exit(main())
^^^^^^
File "C:\Users\Mohammed\Downloads\core\pwb.py", line 35, in main
runpy.run_path(str(path), run_name='__main__')
File "<frozen runpy>", line 291, in run_path
File "<frozen runpy>", line 98, in _run_module_code
File "<frozen runpy>", line 88, in _run_code
File "C:\Users\Mohammed\Downloads\core\pywikibot\scripts\wrapper.py", line 513, in <module>
main()
File "C:\Users\Mohammed\Downloads\core\pywikibot\scripts\wrapper.py", line 497, in main
if not execute():
^^^^^^^^^
File "C:\Users\Mohammed\Downloads\core\pywikibot\scripts\wrapper.py", line 484, in execute
run_python_file(filename, script_args, module)
File "C:\Users\Mohammed\Downloads\core\pywikibot\scripts\wrapper.py", line 147, in run_python_file
exec(compile(source, filename, 'exec', dont_inherit=True),
File "C:\Users\Mohammed\Downloads\core\scripts\cosmetic_changes.py", line 131, in <module>
main()
File "C:\Users\Mohammed\Downloads\core\scripts\cosmetic_changes.py", line 127, in main
bot.run()
File "C:\Users\Mohammed\Downloads\core\pywikibot\bot.py", line 1671, in run
self.treat(page)
File "C:\Users\Mohammed\Downloads\core\pywikibot\bot.py", line 1924, in treat
self.treat_page()
File "C:\Users\Mohammed\Downloads\core\scripts\cosmetic_changes.py", line 84, in treat_page
new_text = cc_toolkit.change(old_text)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Mohammed\Downloads\core\pywikibot\cosmetic_changes.py", line 302, in change
new_text = self._change(text)
^^^^^^^^^^^^^^^^^^
File "C:\Users\Mohammed\Downloads\core\pywikibot\cosmetic_changes.py", line 296, in _change
text = self.safe_execute(method, text)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Mohammed\Downloads\core\pywikibot\cosmetic_changes.py", line 283, in safe_execute
result = method(text)
^^^^^^^^^^^^
File "C:\Users\Mohammed\Downloads\core\pywikibot\cosmetic_changes.py", line 712, in removeEmptySections
next_dep = sections[i + 1].level
^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Mohammed\Downloads\core\pywikibot\textlib.py", line 960, in level
return min(map(len, m.groups()))
^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'groups'
CRITICAL: Exiting due to uncaught exception AttributeError: 'NoneType' object has no attribute 'groups'
```
**What happens?**
This error happens when the wikitext of the page contains syntax such as:
* Empty header text `====`
* Comment before the header on the same line `<! -- -->== header text ==`
**What should have happened instead?**:
When encountering such error, the bot should have skipped the page and continued working on other pages instead.
**Software version:**
```
Pywikibot: [https] r-pywikibot-core (ddd39e6, g17979, 2023/07/13, 11:34:35, master)
Release version: 8.3.0.dev0
setuptools version: 68.0.0
mwparserfromhell version: 0.6.4
wikitextparser version: n/a
requests version: 2.31.0
certificate test: ok
Python: 3.11.4 (tags/v3.11.4:d2340ef, Jun 7 2023, 05:45:37) [MSC v.1934 64 bit (AMD64)]
```