jQuery Grid Plugin - jqGrid

Hi,

please take a look at the following fiddle:

http://jsfiddle.net/M85X3/3/

I have a grid with some persons. Each person has a forename, a surname and an age. There is one person without an age (value is null).

When I dynamically group the grid data by age with asc sorting order everything works fine (I'm using the formatDisplayField Callback function to show "Empty" when the value is null).

But when I group the data with desc sorting order, the person with no age is put into the wrong group.

Cheers

M