React Router Error - TypeError: Cannot read property 'func' of undefined

Question

Tried almost everything available on the Internet, and couldn't resolve the problem. When I installed react-router-dom and added Routes and BrowserRouter into my project, I faced this problem:

Uncaught TypeError: Cannot read property 'func' of undefined

and in bundled index.js there is a line where app fails:

var func = _react.PropTypes.func,

Found some solutions stating that react-router 3.2.0 should be used, but that is not the point. I want to use new react-router-dom, currently, installed version is :

    "react-router-dom": "^4.4.0-alpha.1",

NOTE: Please don't mention PropTypes, I know that they've moved in a separate library and I didn't use them in my project.

---

EDIT: Routes code:

import React from 'react';
import {Route, Switch, BrowserRouter} from 'react-router-dom';
//import createHashHistory from 'history/createHashHistory';
import App from './App';
import Login from './components/Login/Login';
import PrivateRoute from './components/PrivateRoute/PrivateRoute';
import Unauthorized from './components/Unauthorized/Unauthorized';

//const history = createHashHistory();


const Routes = () => (
    <BrowserRouter>
        <Switch>
            <Route exact path="/login" component={Login}/>
            <Route exact path="/unauthorized" component={Unauthorized}/>
            <PrivateRoute exact path="/" component={App}/>
        </Switch>
    </BrowserRouter>
);

export default Routes;

PrivateRoute component code:

import React, {Component} from "react";
import {bindActionCreators} from "redux";
import {Redirect, Route} from "react-router-dom";
import {connect} from "react-redux";
import * as authActions from '../../redux/actions/authActions';


class PrivateRoute extends Component {
    render() {
        let {component: Component, loggedUser, ...rest} = this.props;

        return (
            <Route {...rest} render={(props) => (
                loggedUser ?
                    <Component {...props}/>
                    :
                    <Redirect
                        to={{
                            pathname: "/login",
                            state: {from: props.location}
                        }}
                    />
            )}/>
        );
    }
}

function mapStateToProps(state, props) {
    return {
        loggedUser: state.loggedUser
    }
}

function mapDispatchToProps(dispatch) {
    return {
        authActions: bindActionCreators(authActions, dispatch)
    }
}

export default connect(mapStateToProps, mapDispatchToProps)(PrivateRoute);