jQuery Grid Plugin - jqGrid

Hi,

I've encountered strange behavior of addRowData method. When I add row like: 

$("#"+subGridID).addRowData("1", {id:"1",text:"text"});

it throws the following exception:

Uncaught TypeError: Cannot read property 'rownumbers' of undefined jquery.jqGrid.min.0.0.0.0.js:98

subGridID -> ID of the subgrid 🙂 I create it using the following code:

subGridRowExpanded: function(subgrid_id, row_id) {

var subgrid_table_id;

subgrid_table_id = subgrid_id+"_t";

$("#${searchResultsGridID}").setCell(row_id,'subGridID',subgrid_id);

$("#"+subgrid_id).html('<table id="'+subgrid_table_id+'" class="scroll"></table>');

jQuery("#"+subgrid_table_id).jqGrid({

url:'someurl.html',

datatype: "json",

colModel: [

{name:'parentKeyID', index:'parentKeyID', width:0, align:'center',hidden:true},

{name:'id', index:'id', width:30, align:'center',hidden:true},

{label:'Text', name:'text', index:'text', width:350, align:'center'},

],

jsonReader: {

root: "rows",

page: "page",

total: "total",

records: "records",

repeatitems: false,

userdata: "userdata",

id: "id",

cell: "cell"

},

rowNum:20,

sortname: 'id',

sortorder: "asc",

height: '100%',

width: '500',

postData:{resourceKeyID:row_id}

});

},

I would be really appreciated for any kind of help! Thx!