How to add click event in geochart?

Using Angular 4.3.1 I can show province map of Netherlands using:

  public map_ChartData = [
    ['Provinces',   'Popularity'],
         [{ v: 'NL-DR', f: 'Drenthe' },  5],
         [{ v: 'NL-NH', f: 'Noord-Holland' },  1000],
         [{ v: 'NL-UT', f: 'Utrecht' },  800],
         [{ v: 'NL-FL', f: 'Flevoland' },  200],
         [{ v: 'NL-FR', f: 'Friesland' },  350],
         [{ v: 'NL-GE', f: 'Gelderland' },  450],
         [{ v: 'NL-GR', f: 'Groningen' },  788],
         [{ v: 'NL-LI', f: 'Limburg' },  244],
         [{ v: 'NL-NB', f: 'Noord-Brabant' },  750],
         [{ v: 'NL-OV', f: 'Overijssel' },  620],
         [{ v: 'NL-ZE', f: 'Zeeland' },  50],
         [{ v: 'NL-ZH', f: 'Zuid-Holland' },  890]
      ]; 

  public map_ChartOptions = {
    region: 'NL', resolution: 'provinces',
    enableRegionInteractivity: true,
    colorAxis: {
      minValue: 0,
      maxValue: 1000,      
      colors: ['grey', 'yellow', 'orange', 'blue', 'green']
    }};

  itemSelected(evt) {
    console.log(evt);
  }

<div id="map_chart" 
(itemSelect)="itemSelected($event)" 
(itemDeselect)="itemDeselected($event)" 
[chartData]="map_ChartData"
[chartOptions]="map_ChartOptions" 
chartType="GeoChart" 
GoogleChart></div>

When I click on a province I get an error in Chrome console:

core.es5.js:1020 ERROR Error: Invalid column index null. Should be an integer in the range [0-1].
    at gvjs_en (jsapi_compiled_default_module.js:75)
    at gvjs_P.gvjs_.getValue (jsapi_compiled_default_module.js:89)
    at angular2-google-chart.directive.ts:52
    at gvjs_Zn.<anonymous> (jsapi_compiled_default_module.js:179)
    at gvjs__n (jsapi_compiled_default_module.js:129)
    at gvjs_Zn.gvjs_.dispatchEvent (jsapi_compiled_default_module.js:127)
    at gvjs_U (jsapi_compiled_default_module.js:178)
    at jsapi_compiled_default_module.js:252
    at gvjs_Zn.<anonymous> (jsapi_compiled_default_module.js:179)
    at gvjs__n (jsapi_compiled_default_module.js:129)

vimalavinisha / angular2-google-chart

How to add click event in geochart? #55