Update app.js

@@ -60,6 +60,7 @@ console.log(res.statusCode);
   Promise
   Promise
     .all(req.body.events.map(handleEvent))
     .all(req.body.events.map(handleEvent))
     .then((result) => res.json(result))
     .then((result) => res.json(result))
+    .catch((err)=>{console.log(err);})
 });
 });
 // event handler
 // event handler
 function handleEvent(event) {
 function handleEvent(event) {