Already existing user causes error when subscribing to email marketing

[renzon]

Returning error:

{result_code: 0, result_message: 'Esse e-mail já existe no sistema. Por favor escolha outro e-mail.', result_output: 'json'}

[renzon]

To reproduce: there must be a user on AC with "[email protected]" and with id, let´s say 1. User has another account, let´s say with id 2 and email "[email protected]". When she tries to register again, SPP form will fill her email "[email protected]". But she edit it to bem "[email protected]". This way system will query AC for user with id 2 and will try to edit her email to "[email protected]". But since this email is already taken, this error occurs. Not sure how to solve this.