title: Discord.js Welcome Message dont show avatar
body: <p>I have the following problem. This code works, but if a User hasn't a profile picture, it shows an error and didnt send the Embed.</p>
  
  <p>The Code:</p>
  
  <pre><code>   client.on('guildMemberRemove', member =&gt; {   
       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)
  
       })
  </code></pre>
  
  <p>The Error:</p>
  
  <pre><code>    (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.
  </code></pre>
  
  <p>Can someone help me?</p>