TypeError: Cannot read property 'func' of undefined

Várias vezes aparece esse erro, que aparentemente é relacionado ao React Router. Eu instalei a versão 3.0.0, como orientado.

O erro acontece nesse comando

var func = _react.PropTypes.func,

em node_modules/react-router/lib/PropTypes.js:8, com o seguinte stacktrace:

PropTypes.js:8 Uncaught TypeError: Cannot read property 'func' of undefined
    at Object../node_modules/react-router/lib/PropTypes.js (PropTypes.js:8)
    at __webpack_require__ (bootstrap 6e7e0e18ba30650ad573:669)
    at fn (bootstrap 6e7e0e18ba30650ad573:87)
    at Object../node_modules/react-router/lib/index.js (index.js:15)
    at __webpack_require__ (bootstrap 6e7e0e18ba30650ad573:669)
    at fn (bootstrap 6e7e0e18ba30650ad573:87)
    at Object../src/componentes/Login.js (Header.js:3)
    at __webpack_require__ (bootstrap 6e7e0e18ba30650ad573:669)
    at fn (bootstrap 6e7e0e18ba30650ad573:87)
    at Object../src/index.js (s2.png:1)
    at __webpack_require__ (bootstrap 6e7e0e18ba30650ad573:669)
    at fn (bootstrap 6e7e0e18ba30650ad573:87)
    at Object.0 (registerServiceWorker.js:108)
    at __webpack_require__ (bootstrap 6e7e0e18ba30650ad573:669)
    at bootstrap 6e7e0e18ba30650ad573:715
    at bundle.js:719

Obrigado.