PrismarineJS / PrismarineJS/node-minecraft-protocol
Internal Exception when joining an NMP server with a 1.7 client
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Description
[X ] The FAQ doesn't contain a resolution to my issue
Versions
- minecraft-protocol: 1.20.2
- node: 12.1.0
Detailed description of a problem
When joining a server created with NMP that has version set to false (to enable multi-version support) with a vanilla 1.7 client, the client gets kicked with the following message:

Current code
import mc from "minecraft-protocol";
const server = mc.createServer({
port: 25565,
motd: "Test",
maxPlayers: 1,
// @ts-ignore
version: false,
});
server.on("login", (user) => user.end("Test"));
Expected behavior
Expected the client to actually join the server
Additional context
Doesn't happen when explicitly setting version to 1.7.10. Also doesn't happen to other client versions.
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the FAQ.md guidance and the mc.createServer entry point shown in the report. Reproduce the setup with version set to false and a vanilla 1.7 client, then compare it with the explicit 1.7.10 configuration. Done means the vanilla 1.7 client joins successfully without regressing other client versions.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, node.js
- Domain
- networking
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100