A. Ensure that your iPhone is running the latest version of iOS. Go to Settings > General > Software Update to check for updates. Keeping your device updated can resolve compatibility issues that may cause crashes.

B. Try uninstalling and reinstalling the Polarr app. This can clear any corrupted data that might be causing the app to crash. To do this, press and hold the Polarr app icon until it wiggles, then tap the 'X' to delete it. Reinstall it from the App Store.