From 7d2fa852e02c6a40c535974d64d8a12b31073db0 Mon Sep 17 00:00:00 2001
From: Yamagishi Kazutoshi <ykzts@desire.sh>
Date: Sun, 13 Nov 2016 14:08:45 +0900
Subject: [PATCH] Fix #40

---
 lib/xmlhttprequest.js | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/xmlhttprequest.js b/lib/xmlhttprequest.js
index ede9a73..2cf89a8 100644
--- a/lib/xmlhttprequest.js
+++ b/lib/xmlhttprequest.js
@@ -121,14 +121,14 @@ function _receiveResponse(response) {
 }
 
 function _setDispatchProgressEvents(stream) {
-  const _properties = this._properties;
+  const _properties = this._properties || {};
   const loadStartEvent = new ProgressEvent('loadstart');
   this.dispatchEvent(loadStartEvent);
   stream.on('data', () => {
     const progressEvent = new ProgressEvent('progress', {
-      lengthComputable: _properties.lengthComputable,
-      loaded: _properties.loaded,
-      total: _properties.total
+      lengthComputable: _properties.lengthComputable || 0,
+      loaded: _properties.loaded || 0,
+      total: _properties.total || 0
     });
     this.dispatchEvent(progressEvent);
   });