我试图通过使用提及来发出unban命令。如果有一种方法可以通过提及获得用户的id，而不需要他们在我执行命令的实际帮会中，那就太好了。
当尝试执行时，我得到一个错误，告诉我它无法读取未定义的属性“id”。但是当我在用户在公会的时候，它可以很好地阅读。
我的代码：

const Discord = require("discord.js");

module.exports = {
    name: "unban",
    aliases: [],
    usage: "{prefix}unban <user>",
    category: "moderation",
    desc: "Unban a banned user.",
    run: async (client, message, args) => {

        let unbanned1 = message.mentions.users.first().id || args[0];
        let unbanned = await client.users.fetch(unbanned1);

        let ban = await message.guild.fetchBans();

        // MESSAGES

        if (!args[0]) {
            return message.channel.send('❌ - Please specify a user to unban.')
        }

        if (!unbanned) {
            return message.channel.send(`❌ - User not found.`)
        }

        if (!ban.get(unbanned.id)) {
            return message.channel.send("❌ - This user hasn't been banned.")
        }

        // No author permissions
        if (!message.member.hasPermission("BAN_MEMBERS")) {
            return channel.send("❌ You do not have permissions to ban members.")
        }
        // No bot permissions
        if (!message.guild.me.hasPermission("BAN_MEMBERS")) {
            return channel.send("❌ I do not have permissions to ban members. Please contact a staff member")
        }

        var user = ban.get(unbanned1);
        message.guild.members.unban(unbanned1);

        const embed = new Discord.MessageEmbed()
            .setColor("GREEN")
            .setAuthor(user.user.username, user.user.displayAvatarURL({ dynamic: true }))
            .setDescription(`${user.user.tag} got unbanned:`)
            .setTitle("User Unbanned Successfully")
            .addField(`By:`, `${message.author.tag}`, true)
            .setThumbnail(user.user.displayAvatarURL({ dynamic: false }))
            .setFooter(message.member.displayName, message.author.avatarURL({ dynamic: true }))
            .setTimestamp()

        message.channel.send(embed);
    },
};

先谢谢你。