I'm having the same issues with 1.8.5 (from Play Store) and 1.8.9: App crashes after 1 second.
It worked for a short time today, but then kept crashing. I rebootet my phone, uninstalled the app(s) and reinstalled different versions from this thread, but I could not get it to work anymore.
I got some logs, the error message is the same as posted by OzFu:
https://dashcamtalk.com/forum/threads/v1-8-7-android-app-beta-tester-please.38492/#post-460827
Error message for both 1.8.5 and 1.8.9: "java.lang.IllegalArgumentException: path must be convex"
I attached my log to this post.
B1W 1.06.180528 s ("wifi off firmware")
Xiaomi Redmi 4X with LineageOS 15.1 (Android 8.1.0)
App version 1.7.0 works fine.