jquery - unable to get property of 'sku' undefined or null reference -

I have the following jquery for Google Tag Manager

  (for item in cartObject) [Item] [Item] [Categories], "Brand": Cart Object [Item] Item [_ 0xad1e [5]], "Price": cartObject [Item] [_ 0xad1e] [16], "Quantity": cartObject [items] [_ 0xad1e [30]]})}; Ga (_0xad1e [6], _ 0xad1e [38], {"step": _ 0xc357x7}); Ga (_0xad1e [8], _ 0xad1e [9], _ 0xad1e [10], _xx1e [11], _xx1e [39] + _xx357x7, {"nonInteraction": 1}); }  

It seems that to get the variable from the success.html page of my website

  orderObject ['0'] = {'sku' '161', 'Name': 'Trapist Alley Discovery (12 bottles) plus free forty glass', 'value': '38 .5 ',' Quantity ':' 1.0000 ',' Categories ':' Discovery cases, Belgium Browse all our Beer, browse by style, Browse blended cases, Abbey and Trappist ',' Brand ':' '} var transactionObject = {}; '6.9900', 'Tax': '7.5800', 'Shipping': '6.9900', 'Sequode': '' '10002,250', 'Support': 'Beer Hawk', 'Revenue': '6.99 00 ',' Tax ':'}  

It works in all browsers other than Internet Explorer, which gives the following message in the console

  'sku Unable to retrieve the assets of the undefined or zero reference  

My code begins with

    
 
 
 In this article (and others) in Google Analytics  
  cartObject [Item] [sku]  
 
 Item is not a variable sku - it should be a string 
 
 Try 
 
  cartObject [item ] ["Sku"]  
 
 or 
 
  cartObject [item] .sku  
 
 etc.