How to fix: TypeError: Cannot read property 'name' of undefined?

Question

JavaScript

I made a bot for a discord, these lines were responsible for issuing a role when a new player entered the server, but something went wrong. An error is thrown: TypeError: Cannot read property 'name' of undefined
Here is the code:

const Discord = module.require("discord.js");
const bot = new Discord.Client();

var newPlayers = [];
var newPlayer = {};

bot.on('guildMemberAdd', (member) =>
{
    member.send('Добро пожаловать');
    member.addRole(member.roles.some(val => val.name === 'Игрок'));
});

Answer 1

This error can occur if one of the elements of the member.roles array contains the value undefined. See what comes in member.