react-router: react-router 0.13.2 Uncaught TypeError: Cannot call a class as a function

Hi

I’m getting an error when trying to render this simple page with react 0.13.0 and react-router 0.13.2.

var React = require('react');
var Router = require('react-router');
var Route = Router.Route;
var RouteHandler = Router.RouteHandler;

var App = React.createClass({
  render: function() {
    return (
      <div> </div>
    );
  }
});

var routes = (
  <Route handler={App} name="app" path="/">
  </Route>
);
Router.run(routes, function (Handler, state) {
  React.render(<Handler/>, document.getElementById('content'));
});

Chrome complains about the following line.

var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };

The page renders fine if I remove react-router. Any ideas of what could be wrong?

Cheers, -Kristoffer