diff --git a/rero_ils/modules/libraries/api.py b/rero_ils/modules/libraries/api.py
index e72391a861..2a033eb93f 100644
--- a/rero_ils/modules/libraries/api.py
+++ b/rero_ils/modules/libraries/api.py
@@ -378,6 +378,7 @@ def email_notification_type(libray, notification_type):
     :return: the email corresponding to the notification type.
     :rtype: string
     """
-    for setting in libray['notification_settings']:
+    # notification_settings is not a required field.
+    for setting in libray.get('notification_settings', []):
         if setting['type'] == notification_type:
             return setting['email']