Error in home assistant companion app when running add on

[BjornPython]

When I open the HA companion app in my phone, I get this error:

to reproduce:

• use nabu casa
• follow guide from official docs
• have generate_ssl_cert set to true
• start add on
• open HA companion app using https URL from nabu casa/http:<HA IP here>:8123

there is no error when:

• the add on is not started
• I am using the chrome browser app (accepted the ssl cert https://:8089/ws )
• fully kiosk browser lockdown with its setting ignore SSL errors turned on

my configuration file for the add on:

ami_password: password
auto_add: true
auto_add_secret: password
video_support: true
generate_ssl_cert: true
certfile: fullchain.pem
keyfile: privkey.pem
additional_sounds: []
mailbox: false
mailbox_port: 12345
mailbox_password: password
mailbox_extension: "100"
mailbox_google_api_key: my-google-stt-key
log_level: info