accessing this.elem.contentWindow throws null reference exception after video is removed from DOM

player-0.1.0.min.js:formatted:224 Uncaught TypeError: Cannot read properties of null (reading 'postMessage')
    at d.Player.send (player-0.1.0.min.js:formatted:224:55)
    at d.Player.ready (player-0.1.0.min.js:formatted:255:18)
    at d.Player.receive (player-0.1.0.min.js:formatted:240:120)
    at player-0.1.0.min.js:formatted:208:15