Direct answer
Restart the phone, clear the app's cache, update the app and Android System WebView, free storage, and if it still crashes, clear the app's data or reinstall it.
Quick fixes
- Force stop the app and reopen it.
- Restart the device.
- Settings → Apps → the app → Storage → Clear cache.
Update the pieces it depends on
- Update the app itself (from the same source as before).
- Update Android System WebView and Google Chrome in the Play Store — many crashes across apps trace back to them.
- Install pending system updates.
Free space and memory
Android becomes unstable with less than about 1 GB free. Delete unused files and close heavy background apps.
Reset the app
- Clear data (this resets settings and logins).
- If that fails, uninstall and reinstall.
- Check for crashes in Safe Mode — if it works there, another app is interfering.
When it is not your phone
Apps that depend on a remote server can crash when that server changes or goes down. If the app worked yesterday and nothing changed on your phone, wait for an update from the developer.
FAQ
Will clearing cache delete my data?
No. Clearing cache only removes temporary files; clearing data resets the app.