diff --git a/local-cli/server/middleware/heapCaptureMiddleware.js b/local-cli/server/middleware/heapCaptureMiddleware.js
index 7811027b5b9..372095317c6 100644
--- a/local-cli/server/middleware/heapCaptureMiddleware.js
+++ b/local-cli/server/middleware/heapCaptureMiddleware.js
@@ -26,6 +26,11 @@ function getSourceMapForUrl(url, onFailure, onSuccess) {
     return;
   }
 
+  if (url === 'assets://default_bundle') {
+    onFailure('Don\'t know how to symbolicate in-app bundle, please load from server');
+    return;
+  }
+
   const parsedUrl = urlLib.parse(url);
   const options = {
     host: 'localhost',