I am makeing a minecraft ping discord bot and it is throwing this error when my server is offline

  1  const ms = require('ms')
  2  const fetch = require('node-fetch')
  3  const Discord = require('discord.js')
  4  const client = new Discord.Client()
  5  
  6  const config = require('./config.json')
  7  
  8  /**
  9   * This function is used to update statistics channel
 10   */
 11  const updateChannel = async () => {
 12  
 13      // Fetch statistics from mcapi.us
 14      const res = await fetch(`https://mcapi.us/server/status?ip=${config.ipAddress}${config.port ? `&port=${config.port}` : ''}`)
 15      if (!res) {
 16          const statusChannelName = `【🛡】Status: Offline`
 17          client.channels.cache.get(config.statusChannel).setName(statusChannelName)
 18          return false
 19      }
 20      // Parse the mcapi.us response
 21      const body = await res.json()
 22  
 23      // Get the current player count, or set it to 0
 24      const players = body.players.now
 25  
 26      // Get the server status
 27      const status = (body.online ? "Online" : "Offline")
 28  
 29      // Generate channel names
 30      const playersChannelName = `【👥】Players: ${players}`
 31      const statusChannelName = `【🛡】Status: ${status}`
 32  
 33      // Update channel names
 34      client.channels.cache.get(config.playersChannel).setName(playersChannelName)
 35      client.channels.cache.get(config.statusChannel).setName(statusChannelName)
 36  
 37      return true
 38  }
 39  
 40  client.on('ready', () => {
 41      console.log(`Ready. Logged as ${client.user.tag}.`)
 42      setInterval(() => {
 43          updateChannel()
 44      }, ms(config.updateInterval))
 45  })
 46  
 47  client.on('message', async (message) => {
 48  
 49      if(message.content === `${config.prefix}force-update`){
 50          if (!message.member.hasPermission('MANAGE_MESSAGES')) {
 51              return message.channel.send('Only server moderators can run this command!')
 52          }
 53          const sentMessage = await message.channel.send("Updating the channels, please wait...")
 54          await updateChannel()
 55          sentMessage.edit("Channels were updated successfully!")
 56      }
 57  
 58      if(message.content === `${config.prefix}stats`){
 59          const sentMessage = await message.channel.send("Fetching statistics, please wait...")
 60  
 61          // Fetch statistics from mcapi.us
 62          const res = await fetch(`https://mcapi.us/server/status?ip=${config.ipAddress}${config.port ? `&port=${config.port}` : ''}`)
 63          if (!res) return message.channel.send(`Looks like your server is not reachable... Please verify it's online and it isn't blocking access!`)
 64          // Parse the mcapi.us response
 65          const body = await res.json()
 66  
 67          const attachment = new Discord.MessageAttachment(Buffer.from(body.favicon.substr('data:image/png;base64'.length), 'base64'), "icon.png")
 68          const embed = new Discord.MessageEmbed()
 69              .setAuthor(config.ipAddress)
 70              .attachFiles(attachment)
 71              .setThumbnail("attachment://icon.png")
 72              .addField("Version", body.server.name)
 73              .addField("Connected", `${body.players.now} players`)
 74              .addField("Maximum", `${body.players.max} players`)
 75              .addField("Status", (body.online ? "Online" : "Offline"))
 76              .setColor("#FF0000")
 77              .setFooter("Open Source Minecraft Discord Bot")
 78          
 79          sentMessage.edit(`:chart_with_upwards_trend: Here are the stats for **${config.ipAddress}**:`, { embed })
 80      }
 81  
 82  })
 83  client.login(config.token)

(node:7548) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'substr' of null at Client. (C:\Users\RCIIND_4\Desktop\Vs Code\index.js:67:83) at processTicksAndRejections (internal/process/task_queues.js:95:5) (Use node --trace-warnings ... to show where the warning was created) (node:7548) 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 --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1) (node:7548) [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.