IE 8 and script error on e.default

[StephaneG31]

For some reason we try to be compliant with IE 8 (I know it's not new).
With IE8 we don't use customProtocolCheck function but we load the script.
We include custom-protocol-check.min.js in our pages.

IE8 (we test with W10 with IE11 but in compatibilty mode 8), there's an error with e.default

var n = e && e.__esModule ? function () {
                return e.default
            } : function () {
                return e
            };

Is it possible to fix that with something like e["default"] ?