diff --git a/bookstore/server.js b/bookstore/server.js
index 15a41c60..26f5d843 100644
--- a/bookstore/server.js
+++ b/bookstore/server.js
@@ -19,4 +19,4 @@ module.exports = cds.server
 
 // For didactic reasons in capire
 const { ReviewsService, OrdersService } = cds.requires
-if (!ReviewsService.credentials && !OrdersService.credentials) cds.requires.messaging = false
+if (!ReviewsService?.credentials && !OrdersService?.credentials) cds.requires.messaging = false