not well-formed (invalid token) error when extendeddata added

[Duoquote]

Is there a data limit for extendeddata? I am trying to write 20 columns, I thought maybe it has something to do with some characters but if I remove random a few columns it completes saving. I also am not abled to track down the issue as the error doesn't give me a reasonable information. What could be the issue?

county_fol = city_fol.newfolder(name=county[0])
for row in group_data:
    if row[-1] is None:
        continue
    geom = json.loads(row[-1])
    if geom is None:
        continue
    poly = county_fol.newpolygon(
        name="area",
        outerboundaryis=geom["coordinates"][0],
        innerboundaryis=geom["coordinates"][1:]
    )

    for idx, col in enumerate(data_cols):
        poly.extendeddata.newdata(col, row[idx])

Traceback (most recent call last):
  File "C:\Users\duoqu\miniconda3\envs\junk\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\duoqu\miniconda3\envs\junk\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "c:\Users\duoqu\.vscode\extensions\ms-python.python-2022.18.2\pythonFiles\lib\python\debugpy\adapter/../..\debugpy\launcher/../..\debugpy\__main__.py", line 39, in <module>
    cli.main()
  File "c:\Users\duoqu\.vscode\extensions\ms-python.python-2022.18.2\pythonFiles\lib\python\debugpy\adapter/../..\debugpy\launcher/../..\debugpy/..\debugpy\server\cli.py", line 430, in main
    run()
  File "c:\Users\duoqu\.vscode\extensions\ms-python.python-2022.18.2\pythonFiles\lib\python\debugpy\adapter/../..\debugpy\launcher/../..\debugpy/..\debugpy\server\cli.py", line 284, in run_file
    runpy.run_path(target, run_name="__main__")
  File "c:\Users\duoqu\.vscode\extensions\ms-python.python-2022.18.2\pythonFiles\lib\python\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 321, in run_path
    return _run_module_code(code, init_globals, run_name,
  File "c:\Users\duoqu\.vscode\extensions\ms-python.python-2022.18.2\pythonFiles\lib\python\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 135, in _run_module_code
    _run_code(code, mod_globals, init_globals,
  File "c:\Users\duoqu\.vscode\extensions\ms-python.python-2022.18.2\pythonFiles\lib\python\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 124, in _run_code
    exec(code, run_globals)
  File "d:\Projects\test\convert.py", line 48, in <module>
    kml.save("areas.kml")
  File "C:\Users\duoqu\miniconda3\envs\junk\lib\site-packages\simplekml\kml.py", line 331, in save
    out = self._genkml(format)
  File "C:\Users\duoqu\miniconda3\envs\junk\lib\site-packages\simplekml\kml.py", line 243, in _genkml
    kml_str = xml.dom.minidom.parseString(xml_str.encode("utf-8"))
  File "C:\Users\duoqu\miniconda3\envs\junk\lib\xml\dom\minidom.py", line 1969, in parseString
    return expatbuilder.parseString(string)
  File "C:\Users\duoqu\miniconda3\envs\junk\lib\xml\dom\expatbuilder.py", line 925, in parseString
    return builder.parseString(string)
  File "C:\Users\duoqu\miniconda3\envs\junk\lib\xml\dom\expatbuilder.py", line 223, in parseString
    parser.Parse(string, True)
xml.parsers.expat.ExpatError: not well-formed (invalid token): line 13, column 198566

Thanks!