我想将所有进入通道 X 的消息转发到通道 Y，这工作正常。但我也想在有图片时将每张图片转发到通道 Y。

收到此错误：未处理的promise拒绝警告：类型错误：无法读取未定义的属性“url”

这是我的代码，希望有人可以帮助我

bot.on('message',async msg => {
    if(msg.channel.id != readingchannel)return
    let content = msg.content
    let pic =  msg.attachments
    let alertembed = new Discord.MessageEmbed()
    .setTitle("TEST")
    .setColor("RANDOM")
    .setDescription(msg.content)
    bot.channels.cache.get(writingchannel).send(alertembed)
    if(msg.attachments.length >= 1)return
    let alertembed2 = new Discord.MessageEmbed()
    .setTitle("TEST")
    .setColor("RANDOM")
    .setDescription(msg.content)
    .setImage(msg.attachments[0].url)
    bot.channels.cache.get(writingchannel).send(alertembed2)
});