Cannot read properties of undefined (reading ws), discord.js

Question

I make ping command in discord.js, but I got an error: TypeError: Cannot read properties of undefined (reading 'ws'). If you can help me, I will be very grateful, this is my code:

const { MessageEmbed } = require("discord.js");
const commandsHandler = require("../../Handlers/commands-handler");

module.exports = {
    name: "ping",
    aliases: ['latency', 'lag'],
    description: "Ping"
    
    execute(message, args, commandName, client, Discord) {
        const Response = new MessageEmbed()
        .setColor("BLUE")
        .setDescription(`🏓${client.ws.ping}ms`);
        message.channel.send({embeds: [Response]});
    }
}

Answer 1

TypeError: Cannot read properties of undefined (reading 'ws')

This means that client in client.ws.ping is undefined.

To prevent your program from crashing add a guard clause for client being undefined like this:

.setDescription(`🏓${client?.ws?.ping || 'undefined'}ms`);

or at right before const Response = new ..., write this:

if (!client) return; // breaks out of function if `client` is `undefined`.

But you'll need to dig deeper to find out why client is coming in undefined.