title: jqGrid Search raises error: TypeError: Cannot read property 'searchrules' of undfined
body: <p>When I switched the jqGrid to use the advanced search - it seems to work fine, except it pops up with the above error  "TypeError: Cannot read property 'searchrules' of undfined" in Chrome when you hit the find button. Weirdly in Firefox the error is: "TypeError: g is undefined".</p>
  
  <p>If I just click ok to the error, the page posts back to my MVC controller just fine. I just want the error to go - any ideas?
  Here is the grid code:</p>
  
  <pre><code>jQuery("#list").jqGrid({
              url: '/Audit/GridData/',
              datatype: 'json',
              mtype: 'GET',
              colNames: ['Id', 'Date', 'Username', 'ObjectName', 'Event', 'Module'],
              colModel: [
        { name: 'Id', index: 'Id', width: 100, align: 'left', searchrules: { required: true }, search: true },
        { name: 'Date', index: 'DateStamp', width: 100, align: 'left', searchrules: { required: true }, search: true },
        { name: 'Username', index: 'Username', width: 200, align: 'left', searchrules: { required: true }, search: true },
        { name: 'ObjectName', index: 'ObjectType', width: 200, align: 'left', searchrules: { required: true }, search: true },
        { name: 'Event', index: 'Event', width: 120, align: 'left', searchrules: { required: true }, search: true },
        { name: 'Module', index: 'Module', width: 120, align: 'left', searchrules: { required: true }, search: true}],
              pager: '#pager',
              rowNum: 10,
              postData: {
                  filters: '{"groupOp":"AND","rules":[{"field":"invdate","op":"gt","data":"2007-09-06"},{"field":"invdate","op":"lt","data":"2007-10-04"},{"field":"name","op":"bw","data":"test"}]}'
              },
              pgbuttons: true,
              rowList: [5, 10, 20, 50],
              sortname: 'Id',
              sortorder: "desc",
              viewrecords: true,
              imgpath: 'http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.16/themes/redmond/images/',
              caption: 'Audits'
          }).navGrid('#pager', { search: true, edit: false, add: false, del: false, searchtext: "Search" }, {}, {}, {}, { multipleSearch: true, sopt: ['eq', 'bw', 'cn', 'gt', 'lt'] });
  </code></pre>
  
  <p>Thanks</p>