diff --git a/src/pixi/renderers/CanvasRenderer.js b/src/pixi/renderers/CanvasRenderer.js
index 125cc9a..a61a785 100644
--- a/src/pixi/renderers/CanvasRenderer.js
+++ b/src/pixi/renderers/CanvasRenderer.js
@@ -199,9 +199,12 @@
 	}
 	
 	// render!
-	for (var i=0; i < displayObject.children.length; i++) 
+	if(displayObject.children)
 	{
-		this.renderDisplayObject(displayObject.children[i]);
+		for (var i=0; i < displayObject.children.length; i++) 
+		{
+			this.renderDisplayObject(displayObject.children[i]);
+		}
 	}
 	
 	this.context.setTransform(1,0,0,1,0,0); 

diff --git a/src/pixi/renderers/CanvasRenderer.js b/src/pixi/renderers/CanvasRenderer.js
index 125cc9a..a61a785 100644
--- a/src/pixi/renderers/CanvasRenderer.js
+++ b/src/pixi/renderers/CanvasRenderer.js
@@ -199,9 +199,12 @@
 	}
 	
 	// render!
-	for (var i=0; i < displayObject.children.length; i++) 
+	if(displayObject.children)
 	{
-		this.renderDisplayObject(displayObject.children[i]);
+		for (var i=0; i < displayObject.children.length; i++) 
+		{
+			this.renderDisplayObject(displayObject.children[i]);
+		}
 	}
 	
 	this.context.setTransform(1,0,0,1,0,0); 
diff --git a/src/pixi/utils/Utils.js b/src/pixi/utils/Utils.js
index 7095e0e..a496754 100644
--- a/src/pixi/utils/Utils.js
+++ b/src/pixi/utils/Utils.js
@@ -1,16 +1,35 @@
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
+// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
+// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
+
+// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel
+
+// MIT license
+
+(function() {
+    var lastTime = 0;
+    var vendors = ['ms', 'moz', 'webkit', 'o'];
+    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
+        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
+        window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] 
+                                   || window[vendors[x]+'CancelRequestAnimationFrame'];
+    }
+
+    if (!window.requestAnimationFrame)
+        window.requestAnimationFrame = function(callback, element) {
+            var currTime = new Date().getTime();
+            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
+            var id = window.setTimeout(function() { callback(currTime + timeToCall); }, 
+              timeToCall);
+            lastTime = currTime + timeToCall;
+            return id;
+        };
+
+    if (!window.cancelAnimationFrame)
+        window.cancelAnimationFrame = function(id) {
+            clearTimeout(id);
+        };
+}());
+window.requestAnimFrame = window.requestAnimationFrame;
 
 function HEXtoRGB(hex) {
 	return [(hex >> 16 & 0xFF) / 255, ( hex >> 8 & 0xFF) / 255, (hex & 0xFF)/ 255];