JavaScript Websocket does not close on WebSocket.close()

Question

I am using Websockets for a chat I am trying to set up. When I connect to the websocket it works fine but when I try to close the socket after two seconds and there was no connection I still get an onerror - even when closing the WebSocket with Websocket.close();

This is my function to set up the websocket:

  reconnectTimeout = null;

  function setupWebSocket(roomId) {
    console.log('setupWebSocket: ' + roomId);


    let ws_path = 'ws://192.168.2.105:8000/chat/' + chatid + '/';

    console.log('Connecting to ' + ws_path);
    chatSocket = new WebSocket(ws_path);

    // Handle incoming messages
    chatSocket.onmessage = function (socketMessage) {
      // Decode the JSON
      // console.log('Got websocket message.');

      let data = JSON.parse(socketMessage.data);

      // Handle joining (Client perspective)
      if (data.join) {
        console.log('Joining room ' + data.join);
      }
      // Handle leaving (client perspective)
      if (data.leave) {
        // do nothing - leave the room
        console.log('Leaving room ' + data.leave);
      }

      if (data.msg_type == "CHATMESSAGE") {
        console.log(data.message);
      }
      if (data.messages_payload) {
        console.log(data.messages);
      }
    };

    chatSocket.addEventListener('open', function () {
      console.log('ChatSocket OPEN');
      if (reconnectTimeout){
        clearTimeout(reconnectTimeout);
        reconnectTimeout = null;
      };
      // if the websocket is really ready to receive messages
      if (chatSocket.readyState == WebSocket.OPEN) {
        chatSocket.send(
          JSON.stringify({
            command: 'join',
            room: roomId,
          }),
        );
      }
    });

    // If websocket get closed set chatSocket to null. Only for security purposes
    chatSocket.onclose = function (e) {
      console.log('ChatSocket onClose.', e.code);
      
      // just in case the websocket didn't close like wanted
      chatSocket = null;
      chatSocket.close();
    };

    // Do nothing if the websocket opens
    chatSocket.onOpen = function (e) {
      console.log('ChatSocket on open', e);
    };

    chatSocket.onerror = function (e) {
      console.log('ChatSocket on error', e);
      chatSocket.close();
    };

    if (chatSocket.readyState == WebSocket.OPEN) {
      console.log('ChatSocket OPEN');
    } else if (chatSocket.readyState == WebSocket.CONNECTING) {
      console.log('ChatSocket connecting..');
    }
  }

setUpWebsocket(3);
setTimeout(() => {
  chatSocket.close();
  chatSocket = null;
}, 2000)

So what I do: I am setting up the websocket and closing it after 2 seconds. When the connection can be build up it works just as I want it to, but when having e.g. no internet the socket does not close after 2 seconds as I want it to but I get this after 10 seconds:

ChatSocket on error {"isTrusted": false, "message": "failed to connect to /192.168.2.105 (port 8000) from /10.0.2.16 (port 51638) after 10000ms"}

Even After I set the chatSocket to null :/