AmMap Export Fails

Based on https://www.amcharts.com/demos/map-with-curved-lines/

by Anton

HTML

<script src="https://www.amcharts.com/lib/3/ammap.js"></script>
<script src="https://www.amcharts.com/lib/3/maps/js/worldLow.js"></script>
<script src="https://www.amcharts.com/lib/3/themes/light.js"></script>

<script src="https://www.amcharts.com/lib/3/plugins/export/export.js">
</script>
<script src="https://www.amcharts.com/lib/3/plugins/export/libs/fabric.js/fabric.min.js">
</script>
<script src="https://www.amcharts.com/lib/3/plugins/export/libs/FileSaver.js/FileSaver.min.js">
</script>

<link href="https://www.amcharts.com/lib/3/plugins/export/export.css" type="text/css" rel="stylesheet" />

<div id="chartdiv"></div>

CSS

#chartdiv {
	width		: 100%;
	height		: 500px;
	font-size	: 11px;
}

JavaScript

var map = AmCharts.makeChart("chartdiv", {
    type: "map",
    "theme": "light",
    
    export: {
      enabled: true,
      "libs": {
        "autoLoad": false
      }
    },
        
    dataProvider: {
        map: "worldLow",
        zoomLevel: 3.5,
        zoomLongitude: -20.1341,
        zoomLatitude: 49.1712,

        lines: [{
            latitudes: [51.5002, 50.4422],
            longitudes: [-0.1262, 30.5367]
        }],
        
        images: [{
            id: "london",
            type: "circle",
            title: "London",
            latitude: 51.5002,
            longitude: -0.1262,
            scale: 1
        }, {
            type: "circle",
            title: "Kiev",
            latitude: 50.4422,
            longitude: 30.5367,
            scale: 0.5
        }]
    },
     
    areasSettings: {
    	unlistedAreasColor: "#FFCC00",
      unlistedAreasAlpha:0.9
    },

    linesSettings: {
        arc: -0.7, // this makes lines curved. Use value from -1 to 1
        arrow: "middle",
        color: "#CC0000",
        alpha: 0.4,
        arrowAlpha: 1,
        arrowSize: 4
    },
    
    zoomControl:{
       gridHeight:100,
       draggerAlpha:1,
       gridAlpha:0.2
    },
     
    backgroundZoomsToTop: true,
    linesAboveImages: true
});
jQuery('.chart-input').off().on('input change',function() {
	var property	= jQuery(this).data('property');
	var target		= map.linesSettings;
  
    target[property] = this.value; 
  
	map.validateNow();
});