grid agreggates server

Good Morning I have a problem with the grid agreggates. while setting the grid with pagination on the server and additionally put the serverAggregates to true, this works very well in my firefox and chrome but in internet explorer tells me the following error:
sum is not defined .

and directs me to debug this part:
anonymous function (data) { var o, e = kendo.htmlEncode; with (data.fcantinv) {o = '<div style=\'text-align:right;\'>' + (kendo.format ("{0: C}", sum )) + '</ div>';} return o; }

Please can you help with this

thanks