Hi there! I'm sorry to hear that the PID Lítačka app is crashing when you try to open it on your iPhone. Let's work together to get this sorted out.

First, could you tell me which model of iPhone you are using and what version of iOS it is running? This will help me provide you with the best troubleshooting steps for your situation.

In the meantime, here are some general steps you can try that may help resolve the issue:

1. Restart Your iPhone: Sometimes, simply restarting your device can clear temporary glitches. Just hold down the power button until you see the "slide to power off" option.

2. Update the App: Make sure you have the latest version of the PID Lítačka app. You can check for updates in the App Store.

3. Check for iOS Updates: Ensure your device has the latest iOS updates. Go to Settings > General > Software Update.

4. Reinstall the App: If the previous steps don’t work, uninstall the PID Lítačka app and then reinstall it. This can often fix crashing issues. Just find the app on your home screen, press and hold it until it wiggles, then tap the "X" to delete it. After that, go to the App Store and download it again.

Let me know how it goes or if you need more assistance!