iOS device model, version and app version
Model Name: iPhone Xs
Software Version: 13.2.3
App version: Can't give app version as it crashes when we click continue
Home Assistant Core Version
0.110.1
Describe the bug
Download app straight from App Store, open it, click Continue, screen flashes to a different screen for a split second, then crashes immediately.
To Reproduce
Download the app and run?
Expected behavior
No crashing...
Screenshots

This is a new issue with 0.110 and will hopefully get sorted out soon, but in the meantime here's the fix: https://companion.home-assistant.io/docs/troubleshooting/faqs#app-crashes-on-set-up
As Sean says the cause of this is known. There is a fix already in the dev version of Home Assistant. You need to specify vales for internal_url and external_url either through the ui or under homeassistant: in configuration.yaml. Please let us know if this fixes your issue
I still get the issue even though my internal and external url values are filled out. Do they need to be a specific format? All I did was copy the internal to the external (as I have nabu casa and will need to set the external up later after setup)

Tried with the nabu casa url with no luck. No clue what values I should be setting here, as our system is Nabu Casa and the app sets that all automatically based on the internal ip.
@snowe2010 do you have http set somewhere? I’d suggest commenting that out temporally if you do. Do you have Remote Control turned on in the Home Assistant Cloud settings?
Also, most importantly, did you restart Home Assistant after adding external_url and internal_url?
I faced the same issue. My workaround was turn off WiFi on phone and setup first time the app with mobile data (obviously you need to have configured to external connection). Then just enabling again WiFi and app didn’t being crashing.
Yep that should get you around the crash. However, I think doing that will not allow the app to know your home wifi SSID and may be a problem for people with hairpin NAT issues
@snowe2010 Can you let me know if you have got past the crash now?
I followed suggestion from @gsubiran above, connected while disabled WiFi, after re-activating WiFi it still works fine. I have the same https addresses for both Internal as External.
I think the issue was restarting HA, but am not sure. It appears to be working now though! Was able to start up and connect and it detected nabu casa correctly and everything appears to be working.
This is fixed via home-assistant/core#36490 which is being released as a quick fix right now
Most helpful comment
This is fixed via home-assistant/core#36490 which is being released as a quick fix right now