Hi @Barwodder,
Welcome to the Make community!
You don’t have to “check” whether the contact exists first - that’s an extra unnecessary step.
1.
All you need to do is add an error handler to your “Create a Contact” module
2.
Then, add an “Update a Contact” module.
Optional
Both modules return a Contact ID, which you can use in a Resume directive module, if needed, to continue the scenario as if the “Create a Contact” module succeeded.