谷歌地图不是在现场工作，而是在本地工作

Question

Html代码

<div class="panel-body">

<div id="map_canvas" style="position: relative;width: 1050px;top: 100%;bottom: 0;height: 500px;"></div>

</div>

Jquery

https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js

https://maps.googleapis.com/maps/api/js?key= **********＆安培;回调= initMap

function initMap() {

var map = new google.maps.Map(document.getElementById('map_canvas'), {
   zoom: 4,
   center: {lat: 20.5937, lng: 78.9629}
});
 setMarkers(map);
}
var beaches = [

            ['India', 20.5937, 78.9629, 1],
           ];

    function setMarkers(map) {
        var image = {
            url: 'https://developers.google.com/maps/documentation/javascript/examples/full/images/beachflag.png',
            size: new google.maps.Size(20, 32),
            origin: new google.maps.Point(0, 0),
            anchor: new google.maps.Point(0, 32)
        };
        var shape = {
            coords: [1, 1, 1, 20, 18, 20, 18, 1],
            type: 'poly'
        };
        for (var i = 0; i < beaches.length; i++) {
            var beach = beaches[i];
            console.log(beach);
            var marker = new google.maps.Marker({
                position: {lat: beach[1], lng: beach[2]},
                map: map,
                icon: image,
                shape: shape,
                title: beach[0],
                zIndex: beach[3]
            });
        }
    }

这是谷歌地图的代码。

问题出在生产中，但在本地工作正常。

生产错误如下：

Uncaught TypeError: Cannot read property 'firstChild' of null
    at Object._.vg (js?key=AIzaSyDSGjhKsJgMAQmzn1E5UTGQvKtNLKKqMNo&callback=initMap:90)
    at new Ag (js?key=AIzaSyDSGjhKsJgMAQmzn1E5UTGQvKtNLKKqMNo&callback=initMap:92)
    at initMap (location:222)
    at js?key=AIzaSyDSGjhKsJgMAQmzn1E5UTGQvKtNLKKqMNo&callback=initMap:98
    at js?key=AIzaSyDSGjhKsJgMAQmzn1E5UTGQvKtNLKKqMNo&callback=initMap:56
    at Object._.Mc (js?key=AIzaSyDSGjhKsJgMAQmzn1E5UTGQvKtNLKKqMNo&callback=initMap:53)
    at Xc (js?key=AIzaSyDSGjhKsJgMAQmzn1E5UTGQvKtNLKKqMNo&callback=initMap:56)
    at js?key=AIzaSyDSGjhKsJgMAQmzn1E5UTGQvKtNLKKqMNo&callback=initMap:135
    at Object.google.maps.Load (js?key=AIzaSyDSGjhKsJgMAQmzn1E5UTGQvKtNLKKqMNo&callback=initMap:21)
    at js?key=AIzaSyDSGjhKsJgMAQmzn1E5UTGQvKtNLKKqMNo&callback=initMap:134