How to redirect default custom module view to another layout?

Hi everyone, I have a custom module and I'm trying to redirect it's default module view (the one that would show a list view) when you click on the module name from the main module menu at the top of the page. The best I can come up with is this:

Add the code below to this file: modules/MyCustomModule/clients/base/layouts/default/default.js

({
  extendsFrom: 'DefaultLayout',
    initialize: function(options) {
        this._super('initialize', [options]);
        window.SUGAR.App.router.navigate('#MyCustomModule/layout/setup', {trigger:true});
    }
})

This works. It will redirect to the layout specified on line 5, however it throws a "Uncaught TypeError: Cannot read property 'append' of null" in sidecar. No matter what I put for line #5 (console.log, alert, another function, etc.) it doesn't matter, it will throw the "Uncaught TypeError". If I remove line #5 there is no error at all.

Is there a way to do this without the javascript error? Is there a better way to redirect from the default module page?

Thanks!