diff --git a/rest_auth/registration/serializers.py b/rest_auth/registration/serializers.py
index 4f99c18..3cafe91 100644
--- a/rest_auth/registration/serializers.py
+++ b/rest_auth/registration/serializers.py
@@ -8,6 +8,7 @@ try:
                                get_username_max_length)
     from allauth.account.adapter import get_adapter
     from allauth.account.utils import setup_user_email
+    from allauth.socialaccount.adapter import get_adapter
     from allauth.socialaccount.helpers import complete_social_login
     from allauth.socialaccount.models import SocialAccount
     from allauth.socialaccount.providers.base import AuthProcess
@@ -139,6 +140,12 @@ class SocialLoginSerializer(serializers.Serializer):
                         _("User is already registered with this e-mail address.")
                     )
 
+            # If signup is disabled, we cannot login a new user
+            if not get_adapter(request).is_open_for_signup(request, login):
+                raise serializers.ValidationError(
+                        _("User is not registered but registration is closed.")
+                    )
+
             login.lookup()
             login.save(request, connect=True)