Use default prefix for DMs

bot.js

@@ -52,11 +52,12 @@ client.on("ready", () => {
 });
 
 client.on("message", async message => {
+  let prefix;
+  if (message.guild) {
     collection.findOne({ guild_id: message.guild.id }, (error, result) => {
       if (error) {
         console.error;
       }
-    let prefix;
       if (!result) {
         console.log(`Guild ${message.guild.id} not in database`);
         return;
@@ -125,6 +126,67 @@ client.on("message", async message => {
         customPrefix(message);
       }
     });
+  } else {
+    prefix = defaultPrefix;
+
+    if (message.content === `<@!${client.user.id}>`) {
+      message.reply(`\nPrefix: \`${prefix}\`\nHelp: \`${prefix}help\`\nChange Prefix: \`${prefix}prefix [new prefix]\``);
+    }
+
+    if (!message.content.startsWith(prefix) || message.author.bot) {
+      return;
+    }
+
+    switch (message.content.toLowerCase()) {
+      case `${prefix}aboutserver`:
+        aboutServer(message);
+        break;
+      case `${prefix}help`:
+        helpMessage(message, prefix);
+        break;
+      case `${prefix}startlogs`:
+        startLogs(message);
+        break;
+      case `${prefix}kulboard`:
+        kulboardCreate(message)
+        break;
+      case `${prefix}ping`:
+        ping(message);
+        break;
+      case `${prefix}iss`:
+        locateISS(message);
+        break;
+      case `${prefix}membercountchannel`:
+        memberCountChannelCreate(message);
+        break;
+    }
+
+    if (message.content.toLowerCase().startsWith(`${prefix}bulkdelete`)) {
+      bulkDelete(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}rolerequest`)) {
+      roleRequest(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}userswith`)) {
+      usersWith(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}ban`)) {
+      ban(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}kick`)) {
+      kick(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}addrole`)) {
+      addRole(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}userinfo`)) {
+      userInfo(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}aboutbot`)) {
+      aboutBot(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}roleinfo`)) {
+      roleInfo(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}addemoji`)) {
+      addEmoji(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}reactionrole`)) {
+      reactionRole(message);
+    } else if (message.content.toLowerCase().startsWith(`${prefix}prefix`)) {
+      customPrefix(message);
+    }
+  }
 });
 
 async function customPrefix(message) {