diff --git a/src/pixi/display/DisplayObject.js b/src/pixi/display/DisplayObject.js
index 938d8c5..02b2b53 100644
--- a/src/pixi/display/DisplayObject.js
+++ b/src/pixi/display/DisplayObject.js
@@ -402,6 +402,9 @@
     // TODO OPTIMIZE THIS!! with dirty
     if(this.rotation !== this.rotationCache)
     {
+        if(isNaN(parseFloat(this.rotation)))
+            throw new Error('DisplayObject rotation values must be numeric.');
+
         this.rotationCache = this.rotation;
         this._sr =  Math.sin(this.rotation);
         this._cr =  Math.cos(this.rotation);
@@ -534,4 +537,4 @@
     set: function(value) {
         this.position.y = value;
     }
-});
\ No newline at end of file
+});