It might be helpful if you could post the debug-info from the bottom of the settings menu (tap text to copy, then paste here).
Could you describe how are you loading the route before the app crashes?
Are you loading from the cloud or importing a GPX file of opening a route link?
Have you tried if the same route will load with an alternative method (e.g., saving .kurviger file on a PC and importing it on the phone? Or sharing and opening a link?)
Is there any error message when the app crashes?
Is it always the same route that is causing the problem or it happens with any route?
Anything else not working as it should?