🔒 Mineflayer issues | Python | Page 1

languid carbonBOT Jul 13, 2025, 1:06 PM

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@untold pike

Python help channel opened

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untold pike Jul 13, 2025, 1:07 PM

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error:

[JSE]       throw error;
[JSE]       ^
[JSE]
[JSE] TypeError [ERR_INVALID_ARG_TYPE]: The "list" argument must be an instance of Array. Received an instance of Buffer
[JSE]     at Function.concat (node:buffer:578:3)
[JSE]     at updateAndValidateSession (C:\Users\yanya\PycharmProjects\mftest.venv\Lib\site-packages\javascript\js\node_modules\minecraft-protocol\src\client\chat.js:61:114)
[JSE]     at Client.<anonymous> (C:\Users\yanya\PycharmProjects\mftest.venv\Lib\site-packages\javascript\js\node_modules\minecraft-protocol\src\client\chat.js:192:55)
[JSE]     at Client.emit (node:events:524:28)
[JSE]     at emitPacket (C:\Users\yanya\PycharmProjects\mftest.venv\Lib\site-packages\javascript\js\node_modules\minecraft-protocol\src\client.js:84:12)
[JSE]     at FullPacketParser.<anonymous> (C:\Users\yanya\PycharmProjects\mftest.venv\Lib\site-packages\javascript\js\node_modules\minecraft-protocol\src\client.js:113:9)
[JSE]     at FullPacketParser.emit (node:events:524:28)
[JSE]     at addChunk (C:\Users\yanya\PycharmProjects\mftest.venv\Lib\site-packages\javascript\js\node_modules\readable-stream\lib\internal\streams\readable.js:323:12)
[JSE]     at readableAddChunk (C:\Users\yanya\PycharmProjects\mftest.venv\Lib\site-packages\javascript\js\node_modules\readable-stream\lib\internal\streams\readable.js:300:9)
[JSE]     at Readable.push (C:\Users\yanya\PycharmProjects\mftest.venv\Lib\site-packages\javascript\js\node_modules\readable-stream\lib\internal\streams\readable.js:246:10) {
[JSE]   code: 'ERR_INVALID_ARG_TYPE'
[JSE] }
[JSE]
[JSE] Node.js v20.19.3

torn citrus Jul 13, 2025, 1:11 PM

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untold pike error: ```[JSE] node:internal/errors:541 [JSE] throw error; [JSE] ^ ...

Hello,what's your issue exactly?

untold pike Jul 13, 2025, 1:12 PM

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when I send a message in chat, I get that error, and the bot leaves the game

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i get that type error of list arg instead of buffer

torn citrus Jul 13, 2025, 1:14 PM

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untold pike i get that type error of list arg instead of buffer

The message you get is a Buffer, not a string.
Just decode it before using:

msg = message.decode('utf-8')
bot.chat('Hi, you said ' + msg)

This should fix it for you hopefully

untold pike Jul 13, 2025, 1:14 PM

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tried that already, still had the same issue

torn citrus Jul 13, 2025, 1:15 PM

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Ohh,wait let me try it on my pc and try debugging it

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Okay try this

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make sure the bot version matches the server. Add 'version': '1.20.1' (or whatever your MC server is) when creating the bot:

bot = mineflayer.createBot({
'host': '192.168.50.250',
'port': 10000,
'username': BOT_USERNAME,
'version': '1.20.1'
})

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If versions mismatch, chat packets can break like that.

untold pike Jul 13, 2025, 1:20 PM

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!close

languid carbonBOT Jul 13, 2025, 1:20 PM

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Python help channel closed with !close

This help channel has been closed. Feel free to create a new post in #1035199133436354600. To maximize your chances of getting a response, check out this guide on asking good questions.

#🔒 Mineflayer issues