There is a bug in the Android webview system that is causing many apps to stop working on some phones. This started yesterday and affects Regrann.
Google has fixed it and released two updates that need to be updated from the play store.
I recommend you install these updates which will help you with all of your apps. If there is nothing to update then it was already done automatically.
- Webview System : https://play.google.com/store/apps/details?id=com.google.android.webview
- Google Chrome: https://play.google.com/store/apps/details?id=com.android.chrome