Node.js Discord.js欢迎消息不显示头像

我有以下问题。这段代码可以工作，但如果用户没有配置文件图片，则会显示错误，并且不会发送嵌入

守则：

   client.on('guildMemberRemove', member => {   
     welcome = JSON.parse(fs.readFileSync("./commands/welcome.json", "utf8"))
     if(!welcome[member.guild.id]) return
       if(!welcome[member.guild.id].channel) return

        const welcome1 = new Discord.RichEmbed()
        .setTitle(`${member.user.username} left the server`)
        .setDescription("Please come back, it was such a good time with you :(")
        .setColor("RED")
        .setThumbnail(`${member.user.avatarURL}`)

        member.guild.channels.get(welcome[member.guild.id].channel).send(welcome1)

     })

错误：

    (node:16164) UnhandledPromiseRejectionWarning: DiscordAPIError: Invalid Form Body
embed.thumbnail.url: Not a well formed URL.
    at C:\Users\Bendix\Desktop\MemeBot\node_modules\discord.js\src\client\rest\RequestHandlers\Sequential.js:85:15
    at C:\Users\Bendix\Desktop\MemeBot\node_modules\snekfetch\src\index.js:215:21
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
(node:16164) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:16164) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

---

有人能帮我吗？

那是因为默认的化身不是存储在.avatarURL下，而是存储在.defaultAvatarURL下。所以你必须这样做：

     welcome = JSON.parse(fs.readFileSync("./commands/welcome.json", "utf8"))
     if(!welcome[member.guild.id]) return
       if(!welcome[member.guild.id].channel) return

        const welcome1 = new Discord.RichEmbed()
        .setTitle(`${member.user.username} left the server`)
        .setDescription("Please come back, it was such a good time with you :(")
        .setColor("RED")
        .setThumbnail(`${member.user.displayAvatarURL()}`)

        member.guild.channels.get(welcome[member.guild.id].channel).send(welcome1)

     })```

let url=member.user.AvatarURL==未定义？member.user.defaultAvatarURL:member.user.avatarURL
const welcome1=新的Discord.RichEmbed（）
.setTitle（`${member.user.username}离开了服务器`）
.setDescription（“请回来，和你在一起真是太好了：（”）
.setColor（“红色”）
.set缩略图（url）
member.guild.channels.get（欢迎[member.guild.id].channel）.发送（welcome1）

---

通过这种方式，它使用一行if语句来检查用户是否有自定义化身，如果没有，则用默认化身替换它。

如果我尝试了这种方法，但它会显示默认化身。如果它显示默认化身URL，则意味着用户没有自定义化身集。但是它有自定义化身，所以你说它甚至会显示de如果用户设置了自定义的头像，是否会出错？是的，我现在正在使用代码，它会显示出来。这个用户有一张个人资料图片