From 813b5e78b0624e42bb2649694cd694f5c793d563 Mon Sep 17 00:00:00 2001
From: benbro <ben.browitt@gmail.com>
Date: Wed, 18 Jul 2012 21:41:36 +0300
Subject: [PATCH] Prevent the error callback from being called twice

---
 src/core.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/core.js b/src/core.js
index 409ae060d..27d5551d1 100644
--- a/src/core.js
+++ b/src/core.js
@@ -52,8 +52,12 @@ function getPdf(arg, callback) {
   if ('progress' in params)
     xhr.onprogress = params.progress || undefined;
 
-  if ('error' in params)
+  var calledErrorBack = false;
+
+  if ('error' in params && !calledErrorBack) {
+    calledErrorBack = true;
     xhr.onerror = params.error || undefined;
+  }
 
   xhr.onreadystatechange = function getPdfOnreadystatechange(e) {
     if (xhr.readyState === 4) {
@@ -61,7 +65,8 @@ function getPdf(arg, callback) {
         var data = (xhr.mozResponseArrayBuffer || xhr.mozResponse ||
                     xhr.responseArrayBuffer || xhr.response);
         callback(data);
-      } else if (params.error) {
+      } else if (params.error && !calledErrorBack) {
+        calledErrorBack = true;
         params.error(e);
       }
     }