Kurviger 1.9.3 integrates a revised location service for higher accuracy and better battery performance (based on Google Location Services).
Your device / rom seems compatible (fused location is on), but eventually it cannot work probably due to some missing elements in the specific rom(?). And the fallback doesn’t seem to be triggered too.
Note that we have tested devices with LineageOS and app works fine, so something seems wrong with the specific rom version.
Nevertheless it was in my plan already to add an option so that users can select if want to use the new fused location service or the previous more native one.
So please stay tuned for the next app version which should resolve the issue. 