diff --git a/app/api/views/new_custom_alias.py b/app/api/views/new_custom_alias.py
index 202e949d..40237056 100644
--- a/app/api/views/new_custom_alias.py
+++ b/app/api/views/new_custom_alias.py
@@ -85,8 +85,9 @@ def new_custom_alias():
     if alias_suffix.startswith("@"):
         alias_domain = alias_suffix[1:]
         domain = CustomDomain.get_by(domain=alias_domain)
-        LOG.d("set alias %s to domain %s", full_alias, domain)
-        alias.custom_domain_id = domain.id
+        if domain:
+            LOG.d("set alias %s to domain %s", full_alias, domain)
+            alias.custom_domain_id = domain.id
 
     db.session.commit()
 
diff --git a/app/dashboard/views/custom_alias.py b/app/dashboard/views/custom_alias.py
index a646acce..e4e25732 100644
--- a/app/dashboard/views/custom_alias.py
+++ b/app/dashboard/views/custom_alias.py
@@ -130,7 +130,8 @@ def custom_alias():
                         )
                         return redirect(url_for("dashboard.custom_alias"))
 
-                    custom_domain_id = domain.id
+                    if domain:
+                        custom_domain_id = domain.id
 
                 alias = Alias.create(
                     user_id=current_user.id,
diff --git a/app/oauth/views/authorize.py b/app/oauth/views/authorize.py
index a076f2dd..73574745 100644
--- a/app/oauth/views/authorize.py
+++ b/app/oauth/views/authorize.py
@@ -192,7 +192,8 @@ def authorize():
                         if alias_suffix.startswith("@"):
                             alias_domain = alias_suffix[1:]
                             domain = CustomDomain.get_by(domain=alias_domain)
-                            alias.custom_domain_id = domain.id
+                            if domain:
+                                alias.custom_domain_id = domain.id
 
                         db.session.flush()
                         flash(f"Alias {full_alias} has been created", "success")