Hi there! I understand that when you search for a specific profile in the Substack app on your iPhone (iOS 18.6.2), the app opens but crashes as soon as you click on that profile. Let’s work through this together.

To start, could you tell me if this happens with just that one particular profile or with any other profiles as well? Also, have you noticed if this occurs on any specific network (Wi-Fi vs. cellular)?

Meanwhile, here are some initial troubleshooting steps we can try:

1. Clear the App Cache: Sometimes cached data can cause crashes. On iOS, you would typically clear this by deleting and reinstalling the app since iOS doesn’t have a direct cache clearing option like Android.

2. Reinstall the Substack app:
- Press and hold the Substack app icon on your home screen.
- Tap "Remove App" > "Delete App."
- Go to the App Store, search for Substack, and reinstall it.

3. Restart your iPhone: Hold the side button and volume up button until the slider appears, then slide to power off. After it shuts down, press the side button again to turn it back on.

4. Check for App Updates: Sometimes developers push fixes for crashes in updates.
- Open the App Store.
- Tap your profile picture at the top right.
- Scroll to see if an update is available for Substack and install it.

If after these steps the problem with that specific profile persists, it might be related to some data issue on that profile's content triggering the crash.

Let me know if you’ve already tried any of these or if you want me to guide you through the steps. If these don’t solve it, I can check a bit more deeply or escalate the issue.

Are you able to try these now?