Hello @endel thanks for your answer,
So I deleted node_modules and package-lock.json, reinstalled colyseus.js at its latest version but the error's still there.

But I got something interesting:
It works with @colyseus/schema 0.4.23 instead of 0.4.29. so I downgraded Schema until I find a solution :)

Hello guys,

I'm running an issue with RN 0.59.5 after doing a room.join, when I dismiss the error, the server got my player join, but room.OnJoin is never called :

Here's my code:

export default class GameScreen extends Component {
  room: any;
  client: any;

  componentDidMount() {
    this.client = new Colyseus.Client("ws://192.168.1.13:4000", {});
    this.onConnection();
  }

  onConnection() {
    this.client.onOpen.add(() => {
      console.log("client connected");
      try {
        this.room = this.client.join("solo");
        this.room.onJoin.add(() => {
          console.log("client joined successfully");
        });
      } catch (err) {
        console.log("test", err);
      }
    });
  } 
} 

In App.ts:

import React, {Component} from "react";
import HomeNavigation from "./src/navigation/home";
import AsyncStorage from "@react-native-community/async-storage";
import {Buffer} from "buffer";
global.Buffer = Buffer;
window = Object.assign(window, {localStorage: AsyncStorage});

interface Props {}

export default class App extends Component<Props> {
  render() {
    return <HomeNavigation />;
  }
}

Many thanks!