Небольшой фикс создания юзера

access/models.py

@@ -78,7 +78,8 @@ class CustomUserManager(BaseUserManager):
 
         email = self.normalize_email(email)
 
-        user = self.model(email=email, is_staff=is_staff, is_active=is_active, first_name=first_name, id=self.last().id +1,
+        user = self.model(email=email, is_staff=is_staff, is_active=is_active, first_name=first_name,
+                          id=self.last().id +1 if self.last() else 0,
                           is_superuser=is_superuser, date_joined=date_joined, last_login=last_login, **extra_fields)
 
         if not password: