Issue with passengers: Cannot read properties of null (reading 'passengers')

[amplitudesxd]

• The FAQ doesn't contain a resolution to my issue

Versions

• mineflayer: 4.27.0
• server: 1.8.9 (Hypixel)
• node: 20.15.1

Detailed description of a problem

When in Hypixel lobbies, there are errors relating to passengers that are not present on older mineflayer versions (such as 4.20.1). I am testing the latest version of Mineflayer, 4.27.0 which has fixes related to passengers, but the issue still persists.

/root/apps/hypixel-bot/node_modules/.pnpm/[email protected][email protected]/node_modules/minecraft-protocol/src/transforms/framing.js:67
          } else { throw e }
                   ^
TypeError: Cannot read properties of null (reading 'passengers')
    at Client.<anonymous> (/root/apps/hypixel-bot/node_modules/.pnpm/[email protected][email protected]/node_modules/mineflayer/lib/plugins/entities.js:816:13)

What did you try yet?

I have tried multiple different mineflayer versions. Before 4.27.0, you could not join the server before getting kicked. Now, it doesn't fail to connect to the server, though does kick after a few seconds.

Mineflayer 4.20.1 is the last working version I found.

Your current code

(summarized)

const bot = mineflayer.createBot({
  host: 'hypixel.net',
  auth: 'microsoft',
  version: '1.8.9',
});

bot.chat('/l bw');
bot.chat('/swaplobby 1');

// now just wait, the bot will crash shortly

Additional context

Implementing null checks before accessing the passengers property prevents the error, but appears to be addressing the symptom rather than the underlying cause:

// Only push to passengers if vehicle is not null
if (vehicle && vehicle.passengers) {
  vehicle.passengers.push(passenger)
}

[amplitudesxd]

Appears to fixed by #3619 as well