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TypeError when "requestJoin" turns false

See original GitHub issue

Using the colyseus-examples, with those changes:

import { Room } from "colyseus";

export class ChatRoom extends Room {

    onInit (options) {
        this.setState({ messages: [] });
        console.log("ChatRoom created!", options);
    }

+    requestJoin(options) {
+       const canJoin = this.clients.length < 2;
+      console.log('can join', canJoin, this.clients.length );
+      return canJoin;
+    }

    onJoin (client) {
        this.state.messages.push(`${ client.id } joined.`);
    }

    onLeave (client) {
        this.state.messages.push(`${ client.id } left.`);
    }

    onMessage (client, data) {
        this.state.messages.push(data.message);
        console.log("ChatRoom:", client.id, data);
    }

    onDispose () {
        console.log("Dispose ChatRoom");
    }

}

I get:

ChatRoom created! {}
can join true 0
can join true 1
process 6992 is responding to REQUEST_JOIN_ROOM
can join true 1
can join false 2
process 6992 is responding to REQUEST_JOIN_ROOM
/src/colyseus-examples/node_modules/colyseus/lib/cluster/Worker.js:100
                process.send([matchMakingPid, joinOptions.clientId, process.pid, room_1.roomId$ score_1]);
                                                                                       ^

TypeError: Cannot read property 'roomId' of undefined
    at /src/colyseus-examples/node_modules/colyseus/lib/cluster/Worker.js:100:88
    at Object.6992:6 (/src/colyseus-examples/node_modules/colyseus/lib/cluster/Worker.js:124:9$
    at Store.consume (/src/colyseus-examples/node_modules/memshared/lib/Store.js:25:47)
    at process.workerHandleIncomingMessage (/src/colyseus-examples/node_modules/memshared/lib/$ndex.js:31:19)
    at emitTwo (events.js:130:20)
    at process.emit (events.js:213:7)
    at handleMessage (internal/child_process.js:753:14)
    at Pipe.channel.onread (internal/child_process.js:472:11)
worker 6986 died. Respawn.
/src/colyseus-examples/node_modules/colyseus/lib/ClusterServer.js:47
                worker.send([Protocol_1.Protocol.PASS_WEBSOCKET, {
                      ^

What should be the expected behavior?