Example code is broken out of the box

[noxabellus]

git clone https://github.com/lance-gg/tinygames.git
cd tinygames/asteroids
npm i
npm run start
> lance-asteroids@5.0.0 start
> node dist-server/main.js

Listening on 3000
file:///home/nox/projects/tinygames/asteroids/node_modules/lance-gg/dist/server/lance-gg.js:28931
            this.id = this.gameEngine.world.getNewId();
                                      ^

TypeError: Cannot read properties of null (reading 'world')
    at new GameObject (file:///home/nox/projects/tinygames/asteroids/node_modules/lance-gg/dist/server/lance-gg.js:28931:39)
    at new PhysicalObject2D (file:///home/nox/projects/tinygames/asteroids/node_modules/lance-gg/dist/server/lance-gg.js:29153:9)
    at new Asteroid (file:///home/nox/projects/tinygames/asteroids/dist-server/common/Asteroid.js:2:16)
    at Serializer.deserialize (file:///home/nox/projects/tinygames/asteroids/node_modules/lance-gg/dist/server/lance-gg.js:29578:19)
    at Asteroid.prunedStringsClone (file:///home/nox/projects/tinygames/asteroids/node_modules/lance-gg/dist/server/lance-gg.js:14344:33)
    at AsteroidsServerEngine.serializeUpdate (file:///home/nox/projects/tinygames/asteroids/node_modules/lance-gg/dist/server/lance-gg.js:30028:27)
    at AsteroidsServerEngine.syncStateToClients (file:///home/nox/projects/tinygames/asteroids/node_modules/lance-gg/dist/server/lance-gg.js:30004:34)
    at Array.map (<anonymous>)
    at AsteroidsServerEngine.step (file:///home/nox/projects/tinygames/asteroids/node_modules/lance-gg/dist/server/lance-gg.js:29973:33)
    at Scheduler.callTick (file:///home/nox/projects/tinygames/asteroids/node_modules/lance-gg/dist/server/lance-gg.js:29531:22)

similar results can be seen for all the example projects here; In Serializer.deserialize there is

let obj = new objectClass(null, {}, {});

and then the GameObject constructor looks like this

    constructor(gameEngine, options, props) {
        super();
        this.gameEngine = gameEngine;
        if (options && options.id)
            this.id = options.id;
        else
            this.id = this.gameEngine.world.getNewId();
        this.playerId = (props && props.playerId) ? props.playerId : 0;
        this.components = {};
    }

So with options empty, it tries to use the null gameEngine that was passed to get a new id. Beyond this I can't really understand what's happening as I'm not really familiar with all the code paths yet.