TypeError: cannot convert <class 'NoneType'> to bytes

[kanstantsin-nikitsin1]

OS: Arch Linux
pan-globalprotect-okta revision: da771a4

Output

[INFO] load conf
[INFO] prelogin request [vpn_url]
[INFO] okta saml request [okta_url]
Traceback (most recent call last):
  File "/opt/pan-globalprotect-okta/./gp-okta.py", line 1226, in <module>
    sys.exit(main())
  File "/opt/pan-globalprotect-okta/./gp-okta.py", line 1178, in main
    rsaml, redirect_url = okta_saml(conf, saml_xml)
  File "/opt/pan-globalprotect-okta/./gp-okta.py", line 475, in okta_saml
    redirect_url = get_redirect_url(conf, c, url)
  File "/opt/pan-globalprotect-okta/./gp-okta.py", line 377, in get_redirect_url
    from_uri = _refx(rx_from_uri)
  File "/opt/pan-globalprotect-okta/./gp-okta.py", line 155, in <lambda>
    _refx = lambda mx: to_b(mx.group(1)).decode('unicode_escape').strip()
  File "/opt/pan-globalprotect-okta/./gp-okta.py", line 91, in to_b
    raise _type_err(v, 'bytes')
TypeError: cannot convert <class 'NoneType'> to bytes

Config details:
I use totp.google

execute = 1
openconnect_cmd = sudo openconnect
openconnect_args =