iOS app login ‘Null check operator used on a null value’

I just installed the iOS Immich app from App Store. When trying to log in using my credentials and server address http://server_ip:2283/api, nothing happens, but the logs show the following error: Null check operator used on a null variable (screenshot attached below). I am on iOS 15.5, iphone 7. Server version is v1.38.2 installed inside a Docker container. I am connecting from local network, so there is no proxy in between. Also login from web ui works just fine.