title: jQuery UI resizable: elem is undefined error in jQuery's acceptData function
body: <p>I'm using jQuery UI Resizable to resize a div. I'm getting "elem is undefined" error in console and I can't figure out what is wrong. </p>
  
  <p>I've tried different jQuery versions.</p>
  
  <p>You can see my app at:
  <a href="http://klip.dev.xhtml.si/" rel="nofollow">http://klip.dev.xhtml.si</a>
  The arrows in the middle of content is the handler for resizable.</p>