_fnProcessingDisplay error occurs when bServerSide, bProcessing, sScrollY are enabled

s0r1n

DataTables works fine using server-side processing (bServerSide: true) and 'processing' indicator (bProcessing: true).
The following error occurs after configuring sScrollY (sScrollY: "300 px"):

• in Firefox

TypeError: an is undefined

for ( var i=0, iLen=an.length ; i<iLen ; i++ )

• in Chrome

Uncaught TypeError: Cannot read property 'length' of undefined 

  _fnProcessingDisplay

  _fnAjaxUpdate

  _fnDraw

  fnDraw 

  fnAdjustColumnSizing 

  (anonymous function)

  fire

  self.fireWith

  jQuery.extend.ready

  completed

The line code belongs to _fnProcessingDisplay function. As a consequence of it, the processing indicator will not be visible during pre-draw. If sScrollY is disabled, the error disapears and the processing indicator will show up.