Error when run MapBox under Blazor

Hi!
When starting MapBox under Blazor I get an error:

How to fix?

In default Blazor project I added:
In head of _Host.cshtml:

    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v1.5.0/mapbox-gl.js'></script>
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v1.5.0/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v1.5.0/mapbox-gl.css' rel='stylesheet' />

    <style>
        body {
            margin: 0;
            padding: 0;
        }

        #map {
            position: absolute;
            top: 0;
            bottom: 0;
            width: 100%;
            height: 100%;
        }
    </style>
    <script src="~/scripts/mapboxMng.js"></script>

mapboxMng.js:

window.mapBoxFunctions = {  
    initMapBox: function () {
        mapboxgl.accessToken = 'pk.eyJ1IjoidGVyZW50ZXYiLCJhIjoiY2sycDN1Z21zMDBheTNrbzZ2aG42aWUyMiJ9._2hucdk7L6jhzEHE6LGv9A';
        window.myMap = new mapboxgl.Map({
            container: 'map',
            style: 'mapbox://styles/mapbox/streets-v11',
            center: [34.047, 63.779],
            zoom: 4.41
        });
        return;         
    }
};

Index.razor:

@page "/"
@inject IJSRuntime JSRuntime;

<div id='map'></div>

@code {
    private string toolbarId = "jqxToolbar";
    protected override void OnAfterRender(bool firstRender)
    {
        JSRuntime.InvokeVoidAsync("mapBoxFunctions.initMapBox");
     }
 }

Start by reviewing the scripts in _Host.cshtml, mapboxMng.js, and Index.razor, then reproduce the reported error in the default Blazor project using the supplied Mapbox setup. Use the linked error image and browser output to identify the failing integration point; done means the map initializes without the reported error.