Discord.js: Issue with joining VoiceChannel

[Andreybest]

Please describe the problem you are having in as much detail as possible:

After joining (connection.join()) VoiceChannel, bot crashes with this issue

TypeError: Right-hand side of 'instanceof' is not callable
    at VoiceConnection.play (C:\Users\Administrator\Desktop\bot\node_modules\discord.js\src\client\voice\util\PlayInterface.js:63:18)
    at VoiceConnection.onSessionDescription (C:\Users\Administrator\Desktop\bot\node_modules\discord.js\src\client\voice\VoiceConnection.js:471:31)
    at VoiceWebSocket.emit (events.js:311:20)
    at VoiceWebSocket.onPacket (C:\Users\Administrator\Desktop\bot\node_modules\discord.js\src\client\voice\networking\VoiceWebSocket.js:189:14)
    at VoiceWebSocket.onMessage (C:\Users\Administrator\Desktop\bot\node_modules\discord.js\src\client\voice\networking\VoiceWebSocket.js:140:19)
    at WebSocket.onMessage (C:\Users\Administrator\Desktop\bot\node_modules\ws\lib\event-target.js:120:16)
    at WebSocket.emit (events.js:311:20)
    at Receiver.receiverOnMessage (C:\Users\Administrator\Desktop\bot\node_modules\ws\lib\websocket.js:800:20)
    at Receiver.emit (events.js:311:20)
    at Receiver.dataMessage (C:\Users\Administrator\Desktop\bot\node_modules\ws\lib\receiver.js:423:14)

Include a reproducible code sample here, if possible:

const Discord = require('discord.js');
const client = new Discord.Client({autoReconnect:true});

client.on("message", msg => {
    if (msg.content === '!connect') {

        if (msg.member.voice.channel) {
            msg.member.voice.channel.join()
            .then(connection => {
                msg.channel.send('Connected');
                connection.on("speaking", (user, speaking) => {
                    if (speaking.bitfield > 0) {
                        dispatcher = connection.play('1.mp3');
                    }
                });
            })
            .catch(console.log);
        }
    }
});

client.login('token');

Further details:

• discord.js version: master
• Node.js version: v12.16.1
• Operating system: Windows Server 2016

• Priority this issue should have: Middle

• [x] I have also tested the issue on latest master, commit hash: 8a2f8938be35e70f87ad99b3860116526e8622e6

[didinele]

If you need help with discord.js installation or usage, please go to the discord.js Discord server instead:
https://discord.gg/bRCvFy9
This issue tracker is only for bug reports and enhancement suggestions.
You won't receive any basic help here.

EDIT: mistakes were made, sorry.

[kyletuite]

I'm getting the same error after updating to the latest commits. Trying to do some troubleshooting now.

[Andreybest]

Thank you!