I've installed 0.7.3 from aur and are connecting to a ocserv that works fine with the cisco anyconnect client. When connecting I'm successfully authenticated and receives the cookies from the server, but then it crashes... any pointers?
See my sanitized logs below:

Using selector: EpollSelector
[info     ] Authenticating to VPN endpoint [openconnect_sso.app] address=some.site.tld name=
Starting new HTTPS connection (1): some.site.tld:443
https://some.site.tld:443 "GET / HTTP/1.1" 200 880
[debug    ] Auth target url                [openconnect_sso.authenticator] url=https://some.site.tld/
[debug    ] Sending auth init request      [openconnect_sso.authenticator] content=b'\n\n  4.7.00136\n  linux-64\n  \n  https://some.site.tld/\n  \n    single-sign-on-v2\n  \n\n'                                                                                         
Starting new HTTPS connection (1): some.site.tld:443
https://some.site.tld:443 "POST / HTTP/1.1" 200 880
[debug    ] Auth init response received    [openconnect_sso.authenticator] content=b'\n\n\nsingle-sign-on-v2\n\n\n<title>Login</title>\nPlease complete the authentication proce
ss in the AnyConnect Login window.\n\nhttps://some.site.tld/+CSCOE+/saml/sp/login\nhttps://some.site.tld/+CSCO
E+/saml_ac_login.html\nhttps://some.site.tld/+CSCOE+/saml/sp/logout\nhttps://some.site.tld/+CSCOE+/saml_ac_login.
html\nacSamlv2Token\nacSamlv2Error\n

\n\n\n'                                                                                                                         
[info     ] Response received              [openconnect_sso.authenticator] id=main message=Please complete the authentication process in the AnyConnect Login window. title=Login
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[info     ] Browser started                [webengine] startup_info=StartupInfo(url='https://some.site.tld/+CSCOE+/saml/sp/login', credentials=None)
[info     ] Loading page                   [webengine] url=https://some.site.tld/+CSCOE+/saml/sp/login
Icon theme "Sardi" not found.
Icon theme "gnome" not found.
Icon theme "elementary" not found.
Icon theme "gnome" not found.
Icon theme "gnome" not found.
[debug    ] Cookie set                     [webengine] name=ESTSAUTHPERSISTENT
[debug    ] Cookie set                     [webengine] name=brcap
[debug    ] Cookie set                     [webengine] name=ch
[debug    ] Cookie set                     [webengine] name=wlidperf
[debug    ] Cookie set                     [webengine] name=buid
[debug    ] Cookie set                     [webengine] name=clrc
[debug    ] Cookie set                     [webengine] name=fpc
[debug    ] Cookie set                     [webengine] name=webvpncontext
[debug    ] Cookie set                     [webengine] name=webvpncontext
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='ESTSAUTHPERSISTENT', value='')                                                                                                          
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='brcap', value='0')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='ch', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='wlidperf', value='FR=L&ST=')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='buid', value='')                                                                                                                                                                                
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='clrc', value='{}')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='fpc', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='webvpncontext', value='=')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='webvpncontext', value='=')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Cookie set                     [webengine] name=webvpncontext
[debug    ] Cookie set                     [webengine] name=acsamlcap
[debug    ] Cookie set                     [webengine] name=tg
[debug    ] Cookie set                     [webengine] name=acSamlv2Error
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='webvpncontext', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='acsamlcap', value='v2')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='tg', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='acSamlv2Error', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Cookie set                     [webengine] name=ESTSAUTHPERSISTENT
[debug    ] Cookie set                     [webengine] name=ESTSAUTH
[debug    ] Cookie set                     [webengine] name=ESTSAUTHLIGHT
[debug    ] Cookie set                     [webengine] name=ch
[debug    ] Cookie set                     [webengine] name=ESTSSC
[debug    ] Cookie set                     [webengine] name=buid
[debug    ] Cookie set                     [webengine] name=SignInStateCookie
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='ESTSAUTHPERSISTENT', value='')                                                                                                         
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Cookie set                     [webengine] name=fpc
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='ESTSAUTH', value='')                                                                            
[debug    ] Cookie set                     [webengine] name=esctx
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Cookie set                     [webengine] name=x-ms-gateway-slice
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='ESTSAUTHLIGHT', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Cookie set                     [webengine] name=stsservicecookie
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='ch', value='n2CLc-425JLbpRoSWg1Recn4ml-W3zwv51UZUcu1d9k')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='ESTSSC', value='00')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='buid', value='')                                                                                                                                                                                
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='SignInStateCookie', value='')                                                                                        
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='fpc', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='esctx', value='')                                             
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='x-ms-gateway-slice', value='estsfd')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='stsservicecookie', value='estsfd')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Cookie set                     [webengine] name=webvpncontext
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='webvpncontext', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Cookie set                     [webengine] name=webvpncontext
[debug    ] Page loaded                    [webengine] url=https://some.site.tld/+CSCOE+/saml/sp/acs
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='webvpncontext', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=Url(url='https://some.site.tld/+CSCOE+/saml/sp/acs')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Browser loaded page            [openconnect_sso.saml_authenticator] url=https://some.site.tld/+CSCOE+/saml/sp/acs
[debug    ] Cookie set                     [webengine] name=webvpncontext
[debug    ] Cookie set                     [webengine] name=acSamlv2Token
[debug    ] Cookie set                     [webengine] name=webvpn
[debug    ] Cookie set                     [webengine] name=webvpnc
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='webvpncontext', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='acSamlv2Token', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='webvpn', value='')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=SetCookie(name='webvpnc', value='bu:/&p:t&iu:1/&sh:&lu:/+CS
COT+/translation-table?textdomain%3DAnyConnect%26type%3Dmanifest&fu:profiles%2F/config/profile.xml&fh:')                                         
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Page loaded                    [webengine] url=https://some.site.tld/+CSCOE+/saml_ac_login.html
[debug    ] Message received from browser  [openconnect_sso.browser.browser] message=Url(url='https://some.site.tld/+CSCOE+/saml_ac_login.html')
[debug    ] Waiting for message from browser process [openconnect_sso.browser.browser]  
[debug    ] Browser loaded page            [openconnect_sso.saml_authenticator] url=https://some.site.tld/+CSCOE+/saml_ac_login.html
[info     ] Terminate requested.           [webengine]  
[info     ] Exiting browser                [webengine]  
[info     ] Browser exited                 [openconnect_sso.browser.browser]  
[debug    ] Sending auth finish request    [openconnect_sso.authenticator] content=b'\n\n  4.7.00136\n  linux-64\n  \n  \n  \n    single-sign
-on-v2\n  \n  \n    \n  \n\n'                                       
https://some.site.tld:443 "POST / HTTP/1.1" 200 454
[debug    ] Auth finish response received  [openconnect_sso.authenticator] content=b'\n\n0.1(1)\n\n<title>SSL VPN Service</title>\n/profiles//config/profile.xml**************\n'       
Traceback (most recent call last):
 File "/usr/bin/openconnect-sso", line 33, in
   sys.exit(load_entry_point('openconnect-sso==0.7.3', 'console_scripts', 'openconnect-sso')())
 File "/usr/lib/python3.9/site-packages/openconnect_sso/cli.py", line 169, in main
   return app.run(args)
 File "/usr/lib/python3.9/site-packages/openconnect_sso/app.py", line 34, in run
   auth_response, selected_profile = asyncio.get_event_loop().run_until_complete(
 File "/usr/lib/python3.9/asyncio/base_events.py", line 642, in run_until_complete
   return future.result()
 File "/usr/lib/python3.9/site-packages/openconnect_sso/app.py", line 139, in _run
   auth_response = await authenticate_to(
 File "/usr/lib/python3.9/site-packages/openconnect_sso/authenticator.py", line 44, in authenticate
   response = self._complete_authentication(auth_request_response, sso_token)
 File "/usr/lib/python3.9/site-packages/openconnect_sso/authenticator.py", line 81, in _complete_authentication
   return parse_response(response)
 File "/usr/lib/python3.9/site-packages/openconnect_sso/authenticator.py", line 142, in parse_response
   return parse_auth_complete_response(xml)
 File "/usr/lib/python3.9/site-packages/openconnect_sso/authenticator.py", line 187, in parse_auth_complete_response
   auth_message=xml.auth.message,
 File "src/lxml/objectify.pyx", line 231, in lxml.objectify.ObjectifiedElement.getattr
 File "src/lxml/objectify.pyx", line 450, in lxml.objectify._lookupChildOrRaise
AttributeError: no such child: message