backbone.js

//This is the line from the stack-trace that's causing the error:


//backbone.js L39
  if (!_ && (typeof require !== 'undefined')) _ = require('underscore');

main.js

requirejs.config({
    shim: {
        'backbone': {
            deps: ['underscore', 'jquery'],
            exports: "Backbone"
        },
        'underscore': {
            exports: "_"
        }
    },
    paths: {
        jquery: 'support/jquery',
        underscore: 'support/underscore',
        backbone: 'support/backbone'
    }
});

define(['underscore', 'backbone'], function (_, Backbone) {
    //Sup

    console.log(Backbone);
    console.log(_);
});