Meteor.user() and .userId() undefined in my component

Hi there,

I’m relatively experienced with Meteor and React in general, however I can’t figure out why this simple piece of data returns undefined every single time.

import React, { Component, PropTypes } from 'react';
import { createContainer } from 'meteor/react-meteor-data';
import { Icon } from 'react-materialize';

export class NavMedewerker extends React.Component{
    constructor(props) {
    render() {
                    <div className="nav-wrapper">
                        <a href="/#" className="brand-logo">
                            <img className="responsive-img" src="/img/logo.png" alt="" style={{ maxHeight: 56 + 'px'}}></img>
                        <a href="#" data-activates="mobile-demo" className="button-collapse">
                            <i className="material-icons">menu</i>
                        <ul id="main-nav" className="right hide-on-med-and-down">
                        {this.props.currentUser ?
                            : ''
                        <ul className="side-nav" id="mobile-demo">
                            <li><a href="/">Home</a></li>
                            <li><a className="dropdown-button" data-activates="dropproductside">Producten<i className="material-icons right">arrow_drop_down</i></a></li>
                            <li><a className="dropdown-button" data-activates="dropwinkelside">Winkels<i className="material-icons right">arrow_drop_down</i></a></li>

NavMedewerker.propTypes = {
  currentUser: PropTypes.object,

export default createContainer(() => {
    return {
        currentUser: Meteor.userId()
}, NavMedewerker);

Whenever I login, the Meteor.userId() is correctly printed to the console from the Login-page component, however when I feed it to the NavMedewerker component, it returns as undefined. Any ideas?

This has been fixed since the time of asking thanks to the members of the gitter chatroom for meteor.

The issue had to do with the fact that I am using FlowRouter and mounted the component rather than the container first.