Grid with aggregates data bug

Hello ,
maybe you can help me with some issue.

I use kendo grid, I have grid with
aggregates data, and it looks like that:

 Grid:
(attach as grid.jpg)

Aggregates: (I don't use all the aggregates)
(attach as Aggregates.jpg)

I save the grid state (paging, grouping,
sorting, filtering and aggregates) in cookie as (Java Script):

var gridState = {           
       page: dataSource.page(),           
       pageSize: dataSource.pageSize(),           
       sort: dataSource.sort(),           
       group: dataSource.group(),
       filter: dataSource.filter(),
      aggregates: dataSource.aggregates()
        };

Cookie (JSON) (Result of saving):
{"page":1,"pageSize":11,"group":[{"field":"Modality","dir":"asc","aggregates":[{"field":"Space","aggregate":"count"},{"field":"Priority","aggregate":"min"},{"field":"Priority","aggregate":"max"},{"field":"Priority","aggregate":"count"},{"field":"Priority","aggregate":"average"}]}],"aggregates":{"Priority":{"min":1,"max":4,"count":148,"average":3.0135135135135136},"Space":{"count":148}}}

And I try to restoring the grid from
cookie that I already save, I loaded it like that:

Restoring the grid state: (paging, grouping , sorting and filtering)
if (gridState!= '' && gridState!= null) {   
      grid.dataSource.query(gridState);
} 

But unfortunately is not work when I use
aggregate, an exception was throw:
"Uncaught ReferenceError: count is not defined"

And I don't understand it because I have count:
(attach as count.jpg)

Anyway those errors occurs just when I started use aggregates. before it, everything work just fine!

Thanks in advance.

Oren.