Cannot read properties of undefined (reading 'length') discord.js

const { Client, GatewayIntentBits } = require('discord.js')
const client = new Client({
    intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMessages,         GatewayIntentBits.MessageContent],
});
const axios = require('axios');
const PREFIX = "!";


client.on('ready', () => {
  console.log(`Logged in as ${client.user.tag}!`);
});


client.on('messageCreate', async (message) => {
  if (message.content.startsWith(PREFIX)) {
    const [command, username] = message.content
      .substring(PREFIX.length)
      .split(' ');

    if (command === 'id') {
      try {
        // Clear the cache before making the API request
        client.users.cache.clear();

        const lowercaseUsername = username.toLowerCase();
        const response = await fetch(`https://users.roblox.com/v1/users/search?    keyword=${encodeURIComponent(lowercaseUsername)}`);
        const { data } = await response.json();
        if (data.length === 0) {
          message.channel.send(`Could not find a user with the name "${username}".`);
        } else {
          const { id } = data[0];
          console.log(`The user "${username}" has the Roblox ID ${id}.`);
          message.channel.send(`The user "${username}" has the Roblox ID ${id}.`);
        }
      } catch (error) {
         console.error(error);
         message.channel.send(`There was an error searching for the user    "${username}".`);
      }
    }
   }
 });

const { Client, GatewayIntentBits } = require('discord.js')
const client = new Client({
    intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMessages,         GatewayIntentBits.MessageContent],
});
const axios = require('axios');
const PREFIX = "!";


client.on('ready', () => {
  console.log(`Logged in as ${client.user.tag}!`);
});


client.on('messageCreate', async (message) => {
  if (message.content.startsWith(PREFIX)) {
    const [command, username] = message.content
      .substring(PREFIX.length)
      .split(' ');

    if (command === 'id') {
      try {
        // Clear the cache before making the API request
        client.users.cache.clear();

        const lowercaseUsername = username.toLowerCase();
        const response = await fetch(`https://users.roblox.com/v1/users/search?    keyword=${encodeURIComponent(lowercaseUsername)}`);
        const { data } = await response.json();
        if (data.length === 0) {
          message.channel.send(`Could not find a user with the name "${username}".`);
        } else {
          const { id } = data[0];
          console.log(`The user "${username}" has the Roblox ID ${id}.`);
          message.channel.send(`The user "${username}" has the Roblox ID ${id}.`);
        }
      } catch (error) {
         console.error(error);
         message.channel.send(`There was an error searching for the user    "${username}".`);
      }
    }
   }
 });