Hi there! I understand that when you try to scan a barcode using the No Thanks app on your iPhone running iOS 15.8.5, the app just closes unexpectedly. Let's work together to get this sorted out.

A few questions to narrow it down:
- Have you recently updated the No Thanks app, or has this problem started happening after an update?
- Have you tried closing the app completely and reopening it before scanning again?
- Is your iPhone's camera working fine in other apps?
- Did you grant the app permission to access your camera?

Meanwhile, I can suggest some steps you can try:

1. Check Camera Permissions
- Go to Settings on your iPhone.
- Scroll down to find No Thanks app.
- Tap it, then make sure Camera permission is enabled.

2. Force Close and Restart the App
- Double press the Home button (or swipe up from the bottom if your iPhone doesn't have a Home button) to see recent apps.
- Swipe up on No Thanks to close it.
- Relaunch the app and try scanning again.

3. Update the App
- Open the App Store, search for No Thanks.
- If an update is available, tap Update. Running the latest version can fix known bugs.

4. Restart Your iPhone
- Press and hold the power button, then slide to power off.
- Turn the phone back on after a few seconds. Sometimes this helps resolve app crashes.

5. Reinstall the App
- If none of the above work, try deleting the app from your device.
- Then reinstall it fresh from the App Store. This can clear corrupted files causing crashes.

Users have reported similar barcode scan crashes on other apps after updates, sometimes resolved by reinstalling or permission checks 1 5.

Please let me know which of these steps you've tried or if you want me to guide you through any of them. I’m here to help!

Are you satisfied with the solution I provided so far?