Hi! I see you're experiencing crashes when opening a chest or completing a lesson on Duolingo on your iPad. Let's take a closer look at this issue so I can help you get back to learning smoothly.

First, could you please tell me if your iPad's operating system (iPadOS) and the Duolingo app are both updated to the latest versions? Sometimes crashes happen due to version mismatches or bugs that get fixed in updates.

Meanwhile, here are some straightforward steps you can try that often resolve this kind of app crashing issue:

1. Restart your iPad: Simple but effective. Power off your device completely, wait about 30 seconds, then turn it on again.

2. Force close the Duolingo app:
- Double-click the Home button or swipe up from the bottom (depending on your iPad model) to bring up the app switcher.
- Find Duolingo and swipe it off the screen to close it.

3. Reinstall the Duolingo app to clear cache and corrupted files:
- Press and hold the Duolingo app icon until it jiggles.
- Tap the "X" or "Remove App" option and confirm uninstall.
- Go to the App Store, search for Duolingo, and reinstall it.

4. Check your network connection: Crashes sometimes occur if there's a network issue when the app tries to sync or load content. Try switching between Wi-Fi and cellular data if possible, or reset network settings by going to Settings > General > Reset > Reset Network Settings (note this will erase saved Wi-Fi passwords).

If you've already done these or the problem persists, I can guide you through some advanced steps or check if there are any known ongoing issues affecting chests and lessons. Let me know how these initial steps go!