From 7ee7d7fa67474c9473333e3f78c7611adf02a7b5 Mon Sep 17 00:00:00 2001
From: Guido Tapia <guido@tapia.com.au>
Date: Tue, 15 Nov 2011 16:07:05 +1100
Subject: [PATCH] It is possible for image tags not to have a 'src' (or
 background-image) attribute specified.  This case currently crashes
 html2canvas.  I know its an edge case but it bit me.  I set the image src
 programatically much later (element is actually not visible at the time I
 call html2canvas).

---
 src/Preload.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Preload.js b/src/Preload.js
index 1465b25..3cbca76 100644
--- a/src/Preload.js
+++ b/src/Preload.js
@@ -250,7 +250,10 @@ html2canvas.Preload = function(element, opts){
     
     // load <img> images
     for (i = 0; i < imgLen; i+=1){
-        methods.loadImage( domImages[i].getAttribute( "src" ) );
+        var imgSrc = domImages[i].getAttribute( "src" );
+        if ( imgSrc ) {
+            methods.loadImage( imgSrc );   
+        }        
     }
     
     // remove 'start'