https://jeffmcmorris.medium.com/getx-flutter-firebase-auth-example-b383c1dd1de2 and code link https://github.com/delay/flutter_starter Is the current version of this project. I switched to using getX. This error should be handled already in the current version of the project. It should not allow you to use the same email on signup or profile update. However it may fail silently. Did you check to see if the user was actually created in firebase? I left this older version of the project for those who might prefer provider but I am no longer actively maintaining it as I no longer use provider.