Warning: Failed child context type: Invalid child context `web3.networkId` of type `string` supplied to `Web3Provider`, expected `number`. in Web3Provider (at src/index.js:13)

[JohannesMayerConda]

My App.js looks like this:

import React from "react";
import ReactDOM from "react-dom";
import * as serviceWorker from "./serviceWorker";
import { Web3Provider } from "react-web3";

ReactDOM.render(
  <Web3Provider>
    {/* <App /> */}
    <div>test</div>
  </Web3Provider>,
  document.getElementById("root")
);

serviceWorker.unregister();

The error disappears when I remove Web3Provider. I tried selecting different networks in MetMask but no change.