null in js demo https://strukturag.github.io/libheif/

[EddyParkinsonAllTraders]

Null on this line:

console.log("Using libheif", libheif.heif_get_version());

Uncaught TypeError: libheif.heif_get_version is not a function at window.onload (libheif/:314:46)

But it works fine if I reload. execution order maybe?

    window.onload = function() {
        hide("loading");
        if (typeof libheif === "undefined") {
            alert("libheif could not be loaded, please check your browser console for details.");
            return;
        }

        console.log("Using libheif", libheif.heif_get_version());
        var demo = new HeifDemo(libheif);

        show("form");