Discord bot throwing error: 'id' property undefined when executing command

Other Questions Discord bot
1

I’m building a Discord bot and running into an issue. When I try to use the -setcaps command, I get this error:

TypeError: Cannot read property 'id' of undefined

I’m not sure what’s causing it. I’m using the latest stable version of Node.js and coding in Notepad++. Here’s a simplified version of my code:

const Discord = require('discord.js');
const botEconomy = require('discord-eco');

const bot = new Discord.Client();
const adminRole = 'Moderator';

bot.on('message', msg => {
  const cmdPrefix = '!';
  const content = msg.content.toUpperCase();
  const args = content.slice(cmdPrefix.length).split(' ').slice(1);

  if (content === `${cmdPrefix}HELLO`) {
    msg.channel.send('Hi there!');
  }

  if (content.startsWith(`${cmdPrefix}ADJUST_BALANCE`)) {
    if (!msg.member.roles.find('name', adminRole)) {
      msg.channel.send(`You need the ${adminRole} role to use this command.`);
      return;
    }

    if (!args[0] || isNaN(args[0])) {
      msg.channel.send(`Usage: ${cmdPrefix}ADJUST_BALANCE <amount> <user>`);
      return;
    }

    const targetUser = msg.mentions.users.first() || msg.author;
    botEconomy.updateBalance(targetUser.id + msg.guild.id, parseInt(args[0]))
      .then(() => msg.channel.send('Balance updated successfully.'));
  }
});

bot.login('BOT_TOKEN_HERE');

Any ideas on what might be causing this error?

2

The error you’re encountering likely stems from the way you’re handling user mentions. Discord.js has evolved, and the current recommended approach is to use the cache property for role and user lookups.

Try modifying your code like this:

const targetUser = msg.mentions.users.first() || msg.author;
const member = msg.guild.members.cache.get(targetUser.id);

if (!member) {
  return msg.channel.send('User not found in this server.');
}

botEconomy.updateBalance(member.id + msg.guild.id, parseInt(args[0]))
  .then(() => msg.channel.send('Balance updated successfully.'));

This ensures you’re working with a valid guild member and should resolve the ‘id’ property issue. Also, consider using Discord.js’s built-in command handler for more robust command processing in the future.

3

hey, i’ve run into this before. it’s probably cuz ur trying to access somethin that doesn’t exist yet. try adding some checks before u use the ‘id’ property, like:

if (msg.mentions.users.first()) {
// do ur thing here
} else {
msg.reply(‘mention a user, dummy!’);
}

that should fix it. lmk if u need more help!

4

I’ve encountered similar issues before, and it’s often related to how the bot is accessing user data. Based on your code, the problem might be in the ADJUST_BALANCE command.

The error suggests that targetUser or msg.guild is undefined when you’re trying to access the id property. This could happen if the mention doesn’t work as expected or if the command is used in a DM where there’s no guild.

To troubleshoot, I’d recommend adding some console.log statements to check the values of targetUser and msg.guild before the updateBalance call. Also, consider adding a null check:

if (targetUser && msg.guild) {
  botEconomy.updateBalance(targetUser.id + msg.guild.id, parseInt(args[0]))
    .then(() => msg.channel.send('Balance updated successfully.'));
} else {
  msg.channel.send('Error: Could not identify user or server.');
}

This should help pinpoint where the undefined value is coming from. Let me know if this helps or if you need further assistance!