diff --git a/data/model/service_keys.py b/data/model/service_keys.py
index 193a25a84..382433da3 100644
--- a/data/model/service_keys.py
+++ b/data/model/service_keys.py
@@ -60,10 +60,11 @@ def _notify_superusers(key):
   if key.expiration_date is not None:
     notification_metadata['expiration_date'] = timegm(key.expiration_date.utctimetuple())
 
-  superusers = User.select().where(User.username << config.app_config['SUPER_USERS'])
-  for superuser in superusers:
-    create_notification('service_key_submitted', superuser, metadata=notification_metadata,
-                        lookup_path='/service_key_approval/{0}/{1}'.format(key.kid, superuser.id))
+  if len(config.app_config['SUPER_USERS']) > 0:
+    superusers = User.select().where(User.username << config.app_config['SUPER_USERS'])
+    for superuser in superusers:
+      create_notification('service_key_submitted', superuser, metadata=notification_metadata,
+                          lookup_path='/service_key_approval/{0}/{1}'.format(key.kid, superuser.id))
 
 
 def create_service_key(name, kid, service, jwk, metadata, expiration_date, rotation_duration=None):