Javascript error thrown in the browser console when using the Offcanvas navbar example

Created by: gomesp

Hi team

I am looking at the examples available on the website and when I use the offcanvas navbar example I keep getting errors thrown in the browser console (using Firefox and Chrome on macOS - all latest versions).

To reproduce it I:

1. Opened the example from the bootstrap website
2. Resized my browser to the small breakpoint to change the navbar
3. Clicked on the burger menu to expand the navbar.

In Firefox I get the following error:

offcanvas.js:207:11
Uncaught TypeError: this._element is undefined
    _addEventListeners offcanvas.js:207
    i event-handler.js:101
    C event-handler.js:196
    on event-handler.js:224
    _addEventListeners offcanvas.js:205
    Oe offcanvas.js:78
    <anonymous> offcanvas.js:262
    s event-handler.js:119
    C event-handler.js:196
    on event-handler.js:224
    <anonymous> offcanvas.js:238
    <anonymous> bootstrap.bundle.min.js:6
    <anonymous> bootstrap.bundle.min.js:6
offcanvas.js:207:11
    _addEventListeners offcanvas.js:207
    i event-handler.js:101
    (Async: EventListener.handleEvent)
    C event-handler.js:196
    on event-handler.js:224
    _addEventListeners offcanvas.js:205
    Oe offcanvas.js:78
    <anonymous> offcanvas.js:262
    s event-handler.js:119
    (Async: EventListener.handleEvent)
    C event-handler.js:196
    on event-handler.js:224
    <anonymous> offcanvas.js:238
    <anonymous> bootstrap.bundle.min.js:6
    <anonymous> bootstrap.bundle.min.js:6

And in Chrome I get a slightly different error:

Uncaught TypeError: Cannot read property 'defaultPrevented' of null
    at Oe.show (offcanvas.js:102)
    at Oe.toggle (offcanvas.js:94)
    at HTMLButtonElement.<anonymous> (offcanvas.js:264)
    at HTMLDocument.s (event-handler.js:119)
show @ offcanvas.js:102
toggle @ offcanvas.js:94
(anonymous) @ offcanvas.js:264
s @ event-handler.js:119