Hi there! I'm really sorry to hear that you're experiencing issues with Ammo Fever crashing when you try to buy ammo. That can definitely be frustrating! Let's see if we can get this sorted out for you.

First, can you let me know if this issue happens every time you attempt to purchase ammo, or is it happening sporadically? Knowing this will help us narrow down the potential cause.

In the meantime, here are a few common troubleshooting steps you can try:

1. Restart the Game: Sometimes simply closing the game and reopening it can resolve crashing issues.

2. Check for Updates: Make sure your game is updated to the latest version. Sometimes, updates contain bug fixes that can resolve crashes.

3. Clear Cache (If Possible): Go to your device settings, find the Ammo Fever app, and clear the cache. This can help if there are any temporary files causing issues.

4. Reinstall the Game: If the issue persists, consider uninstalling and then reinstalling Ammo Fever. This ensures that all the game files are fresh and not corrupted.

Please let me know how it goes, and if this doesn't resolve the issue, we can dive into some more advanced troubleshooting steps!