diff --git a/celery_progress/static/celery_progress/celery_progress.js b/celery_progress/static/celery_progress/celery_progress.js
index 2277544..e0a58d9 100644
--- a/celery_progress/static/celery_progress/celery_progress.js
+++ b/celery_progress/static/celery_progress/celery_progress.js
@@ -75,7 +75,7 @@ var CeleryProgressBar = (function () {
                 } else {
                     onDataError(progressBarElement, progressBarMessageElement, "Data Error");
                 }
-                if (data.result) {
+                if (data.hasOwnProperty('result')) {
                     onResult(resultElement, data.result);
                 }
             }
diff --git a/celery_progress/static/celery_progress/websockets.js b/celery_progress/static/celery_progress/websockets.js
index 7f98d82..6dfb78f 100644
--- a/celery_progress/static/celery_progress/websockets.js
+++ b/celery_progress/static/celery_progress/websockets.js
@@ -48,7 +48,7 @@ var CeleryWebSocketProgressBar = (function () {
                 } else {
                     onTaskError(progressBarElement, progressBarMessageElement, data.result);
                 }
-                if (data.result) {
+                if (data.hasOwnProperty('result')) {
                     onResult(resultElement, data.result);
                 }
                 ProgressSocket.close();