Codeigniter 4 Websockets Error

I ran into an error while using websockets on my project for the first time.
Everything works fine until I got into an error while connecting clients to the web socket server.

Code:

Running server on host 127.0.0.1:8282
Authentication activated
Running server on host 127.0.0.1:8282
New client connected as (162)
Client (162) authentication success
An error has occurred: Undefined property: Takielias\CodeigniterWebsocket\Libraries\CodeigniterWebsocket::$jwt_key

What's causing the error and how to fix please?

See the error message:
An error has occurred: Undefined property: Takielias\CodeigniterWebsocket\Libraries\CodeigniterWebsocket::$jwt_key

It is the reason of the error.

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

See the error message:
An error has occurred: Undefined property: Takielias\CodeigniterWebsocket\Libraries\CodeigniterWebsocket::$jwt_key

It is the reason of the error.

To fix this I had to modify in the vendor folder vendor/takielias/codeigniter4-websocket/src/Libraries/CodeigniterWebsocket.php.

And add this:
/**
     * Default jwt var
     * @var bool
*/
public $jwt_key = false;

Is there any other solutions find out ?
Thx.