Show error message if user opens profile with no ID

Need help
1

Hi guys, I have created a public profile page for users to edit and update. If somebody tries to access either the page without inserting a user ID or the user ID is wrong, I’d like to present them with an error message.

Example
Myapp.com/profile USER SHOWN ERROR MESSAGE
Myapp.com/profile/incorrectuserid User taken to profile
Myapp.com/profile/correctuserid User taken to profile

2

Using a condition

If Get parameter from page URL is Empty then show error “empty link”

3

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