How to handle : Error: Opening COM6: File not found in Node js

So I’m working on connecting an arduino with my computer using Node.js and when the arduino is connected everything works fine, but when is not it obviously throws an error(Error: Opening COM6: File not found) but I’m unable to catch it with a try catch block, it’s important for my program to continue running even if the arduino isn’t connected so I need to handle the error. Here is my code:

        const SerialPort = require('serialport');
        const Readline = require('@serialport/parser-readline');


        class Arduino{
            connect(port, baudRate = 9600, autoOpen = true){
            this.portName = port;
            this.baudRate = baudRate;
            try{
                this.port =  new SerialPort(port, { baudRate: baudRate, autoOpen: autoOpen } );
            }catch(error) {
                console.log(err);
            }

            this.parser =  this.port.pipe(new Readline({ delimiter: 'rn' }));
        }

        var arduino = new Arduino();
        arduino.connect("COM6", 9600);

Here is the hole error:

UnhandledPromiseRejectionWarning: Error: Opening COM6: File not found
(node:12884) 
UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12884) [DEP0018] DeprecationWarning: 
Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Any idea of how to catch the error?
Thank you in advance!

        this.port.on('error', function(err){
            console.log("error ----> " + err);
        })