Very sorry that this is happening!
We have not seen this issue before and have not had any other reports of this happening, so I want to get to the bottom of it. A few questions:
What is your GC username?
Does it always crash on startup? If not, did it consistently crash in one spot in the app? Where?
Are you offline, on Wifi or cell data?
What iPhone do you use?
Thanks, and again, very sorry about this issue.