title: Unhandled promise warn. How to fix it?
body: <p>I have bot which get user message content, delete user message, then send private message to message.author and then send content of user message in embed.
  After few messages bot sends 2 messages instead of 1 and warn appears. Any idea how to fix it?</p>
  <p><strong>Warn:</strong></p>
  <blockquote>
  <p>superadmin@vps-XXXXXX:~/path$ node test.js (node:1059)
  UnhandledPromiseRejectionWarning: DiscordAPIError: Unknown Message
  at RequestHandler.execute (path/node_modules/discord.js/src/rest/RequestHandler.js:170:25)
  at processTicksAndRejections (internal/process/task_queues.js:97:5) (node:1059)
  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(). To terminate the node process on unhandled promise
  rejection, use the CLI flag <code>--unhandled-rejections=strict</code> (see
  <a href="https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode" rel="nofollow noreferrer">https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode</a>).
  (rejection id: 1) (node:1059) [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.</p>
  </blockquote>
  <p><strong>Script:</strong></p>
  <pre><code>const discord = require('discord.js');
  const client = new discord.Client;
  
  client.on('message', message =&gt; {
  if (message.author === client.user &amp;&amp; message.channel.id !== (508728211837026325)) {
    return;
  }
  if (message.channel.id == (508728211837026325)) {
    message.delete();
    message.author.send(&quot;Success!&quot;);
    message.channel.send({
      &quot;embed&quot;: {
        &quot;color&quot;: 61183,
        &quot;description&quot;: message.content + &quot;\n\nCreated by: &quot; + &quot;&lt;@&quot; + message.author.id + &quot;&gt;&quot;,
        &quot;author&quot;: {
          &quot;icon_url&quot;: &quot;imgururl;&quot;,
          &quot;url&quot;: &quot;imgururl&quot;,
          &quot;name&quot;: &quot;test&quot;,
        },
        timestamp: new Date()
      }
    })
  }
  })
  client.login('token');
  </code></pre>