diff --git a/core/core.js b/core/core.js
index 77443155..f1a583d5 100644
--- a/core/core.js
+++ b/core/core.js
@@ -1145,8 +1145,8 @@ async function blobHandler(request, response, blobId, uri) {
 		}
 
 		let app_object = JSON.parse(utf8Decode(await getBlobOrContent(app_id)));
-		id = app_object.files[uri.substring(1)];
-		if (!id && app_object.files['handler.js']) {
+		id = app_object?.files[uri.substring(1)];
+		if (!id && app_object?.files['handler.js']) {
 			let answer;
 			try {
 				answer = await useAppHandler(