The dropdown can't be closed while click document if set trigger="click"

[tianyingchun]

<Dropdown overlay={menu4} trigger="click">
          <button className="btn btn-info btn-sm">
            点击触发 <i className="glyph-icon glyph-arrow-down"></i>
          </button>
        </Dropdown>

it throw error, Uncaught TypeError: this.popupInstance.getPopupDomNode is not a function
Note: first click trigger button, it works fine. click trigger button repeat twice +, it will throw error.

[yiminghe]

facebook/react#5125