diff --git a/jquery.ba-resize.js b/jquery.ba-resize.js
index 1f41d37..7be7de2 100644
--- a/jquery.ba-resize.js
+++ b/jquery.ba-resize.js
@@ -195,9 +195,10 @@
         // If called from the polling loop, w and h will be passed in as
         // arguments. If called manually, via .trigger( 'resize' ) or .resize(),
         // those values will need to be computed.
-        data.w = w !== undefined ? w : elem.width();
-        data.h = h !== undefined ? h : elem.height();
-        
+        if(typeof data !== 'undefined'){
+          data.w = w !== undefined ? w : elem.width();
+          data.h = h !== undefined ? h : elem.height();
+        }
         old_handler.apply( this, arguments );
       };