The app starts just fine and lets you configure the device to track but the moment you click the "play" button to start mapping it crashes. I'm attaching the log I got via logcat in case it's of any help.
My device is not standard, I'm using a LineageOS 14.1 and I don't have any
google services installed (not a single one).
ttnmapper-logcat-lineageos141-nogapps-20190328190432.txt