Hi there! I see your Katasymbol app keeps crashing right when you open it on your Mac running OS X 10.15.7. Could you share a bit more about when this started happening? For example, was there a recent update to the app or the OS? Also, is the app crashing immediately or after some time? This info will help me guide you better.

Meanwhile, here are some initial steps we can try to fix the crashing:

1. Restart your Mac: Sometimes a simple restart clears temporary glitches.
2. Update the app: Check if there's an updated version of Katasymbol available from the Mac App Store or the developer's website and install it if available.
3. Clear app cache and preferences:
- Quit the app completely.
- Go to Finder, press Command+Shift+G, then enter ~/Library/Application Support/ and look for a folder related to Katasymbol. You can back up and then delete it.
- Also check ~/Library/Preferences/ for any Katasymbol preference files and delete them.
4. Reinstall the app: Delete the app from the Applications folder and reinstall it fresh.

If the problem persists, we can dig deeper into logs or check for compatibility issues with your OS version. Let me know how these go or if you've already tried any of these steps!