Django-allauth : prevent user to provide alternative email when logging using social account

I use django-allauth with google and facebook providers and the following options:

SOCIALACCOUNT_AUTO_SIGNUP=True
SOCIALACCOUNT_EMAIL_VERIFICATION="none"

With these settings, django-allauth will use the email provided by the 3rd-party app (Facebook, Google), unless it is already used in an existing account. In this case the user can choose whatever email.

I would like an error message instead of that, saying that the address is already in use since I do not want to validate email with social accounts (using social accounts should be handy).

How to prevent using social accounts that are associated with an address which is already registered?

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