jxqGrid filter exception error

Demonstrates that having a number in the value breaks the filter functions.

by JC Wren

HTML

<link rel="stylesheet" href="https://jqwidgets.com/public/jqwidgets/styles/jqx.base.css">
<link rel="stylesheet" href="https://jqwidgets.com/public/jqwidgets/styles/jqx.energyblue.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.6.0/lodash.min.js"></script>
<script src="https://jqwidgets.com/public/jqwidgets/jqx-all.js"></script>
<div id='jqxgrid'></div>

JavaScript

//
//  Test by clicking the 'Select Filter', uncheck '(Select All)', then check the 'Adult' checkbox
//
//  adult_label = 'Adult 10' causes 'Uncaught TypeError: Cannot read property 'toString' of null' exception
//  adult_label = 'Adult' works correctly
//  adult_lavel = 'Adult 10x' also works correctly
//
var adult_label = 'Adult 10'; 
var adult_value = 'ADULT';

var ages = [{
    label: adult_label,
    value: adult_value,
}, {
    label: 'Junior',
    value: 'JUNIOR',
}, {
    label: 'Senior',
    value: 'SENIOR',
}, {
    label: 'Super Senior',
    value: 'SUPSNR',
}];

var agesSource = {
    datatype: 'array',
    datafields: [{
        name: 'value',
        type: 'string'
    }, {
        name: 'label',
        type: 'string'
    }],
    localdata: ages
};

var agesAdapter = new $.jqx.dataAdapter(agesSource, {
    autoBind: true
});

var players = [{
    sh_fn: 'Steve',
    sh_age: adult_value,
}, {
    sh_fn: 'Carmen',
    sh_age: 'JUNIOR'
}, {
    sh_fn: 'Bilal',
    sh_age: 'SENIOR'
}, {
    sh_fn: 'Peter',
    sh_age: adult_value
}];

var playerSource = {
    datatype: 'array',
    datafields: [{
        name: 'sh_fn',
        type: 'string'
    }, {
        name: 'sh_age',
        type: 'string'
    }, {
        name: 'sh_age_fmt',
        value: 'sh_age',
        values: {
            source: agesAdapter.records,
            value: 'value',
            name: 'label'
        }
    }],
    localdata: players,
    updaterow: function (rowid, newdata, commit) {
        commit(true);
    }
};

var playerAdapter = new $.jqx.dataAdapter(playerSource);

$('#jqxgrid').jqxGrid({
    width: '300px',
    source: playerAdapter,
    autoheight: true,
    altrows: true,
    editable: false,
    filterable: true,
    showfilterrow: true,
    autoshowfiltericon: true,
    columns: [{
        text: 'First Name',
        datafield: 'sh_fn'
    }, {
        text: 'Age',
        datafield: 'sh_age',
        displayfield: 'sh_age_fmt',
        width: 95,
       ...