jQuery Grid Plugin - jqGrid

Following the examples from the demo site I added the following methods to add and remove rows to a clientSide data grid.

    jQuery('#add').click( function () {
        grid.jqGrid('addRowData', dummyRow, {"alias":"New Name","field_type":"","eav":"No"});
    });

    jQuery('#delete').click(function () {
        var a = grid.jqGrid('getGridParam','selrow');
        if(a) {
            grid.jqGrid('delRowData', a);
        } else {
            alert('Please select a row to delete.');
        }
    });

The problem is if I am editing a cell in the new row, but I do not save or escape from editing then after that row is deleted the entire grid becomes non-editable. The grid deifinition is very simple:

grid.jqGrid({
    height: "100%",
    caption: "Transfer Variables",
    pager: "#gridPager",
    pgbuttons: false,
    pginput: false,
    datatype: "local",
    cellEdit: true,
    cellsubmit: "clientArray",
    colModel: [{
        name: 'id',
        label: 'Id',
        index: 'id',
        hidden: true
    },{
        name: 'alias',
        label: 'Alias',
        index: 'alias',
        width: 130,
        editable: true
    },{
        name: 'source_var_name',
        label: 'Variable Name',
        index: 'source_var_name',
        width: 100,
        // use shorthand alias defined above
        editable: true
    }, {
        name: 'field_type',
        label: 'Field Type',
        index: 'field_type',
        width: 80,
        editable: true,
        edittype: "select",
        editoptions: {value:"Identifier:Identifier;Temporal:Temporal;Transfer:Transfer"}
    }, {
        name: 'eav',
        label: 'EAV?',
        index: 'eav',
        width: 50,
        editable: true,
        edittype: "select",
        editoptions: {value:"Yes:Yes;No:No"}
    }, {
        name: 'attribute_col_name',
        label: 'Attribute Column',
        index: 'attribute_col_name',
        width: 100,
        editable: true
    }, {
        name: 'value_col_name',
        label: 'Value Column',
        index: 'value_col_name',
        width: 100,
        editable: true
    }]
    
});