diff --git a/main.py b/main.py
index abc3c41..2eb6d8a 100755
--- a/main.py
+++ b/main.py
@@ -221,7 +221,7 @@ def webhook_receiver():
     elif triggercode.startswith('USERGROUP_'):
         with Connection(ldap_server, config.LDAP_BIND_USER, config.LDAP_BIND_PASSWORD) as ldap_conn:
             manage_group_extra_fields(ldap_conn, obj)
-            group_members = obj['members']
+            group_members = obj['members'] or dict()
             for group_member in group_members.values():
                 manage_user_extra_fields(ldap_conn, group_member, dolibarr_client, manage_user_attrs=False, new_group=obj)
     else: