If the italki app crashes when booking lessons, first update the app to the latest version in the App Store/Google Play and restart your device, because many crashes are caused by old builds or temporary glitches.
Then clear the app cache (Android) or reinstall the app so corrupted local data doesn’t break the booking flow.
Also check your internet connection, disable VPN/proxy, and try booking over Wi-Fi instead of mobile data, since connectivity issues often trigger app errors.
If it still fails, report the problem through italki Support inside the app or via their help/contact form with screenshots of the crash so the support team can investigate.
If the problem remains unresolved after contacting support, consider filing a complaint on Xolvie to raise awareness and pursue a resolution.