Make syncGuilds off limits to bot accounts

src/client/Client.js

@@ -173,12 +173,19 @@ class Client extends EventEmitter {
     return timeout;
   }
 
+  /**
+   * This shouldn't really be necessary to most developers as it is automatically invoked every 30 seconds, however
+   * if you wish to force a sync of Guild data, you can use this. Only applicable to user accounts.
+   * @param {array<Guild>} [guilds=this.guilds.array()] An array of guilds to sync.
+   */
   syncGuilds(guilds = this.guilds.array()) {
+    if (!this.client.user.bot) {
       this.ws.send({
         op: 12,
         d: guilds.map(g => g.id),
       });
     }
+  }
 
   /**
    * Caches a user, or obtains it from the cache if it's already cached.

src/structures/Guild.js

@@ -623,11 +623,13 @@ class Guild {
   }
 
   /**
-   * Syncs this guild (already done automatically every 30 seconds)
+   * Syncs this guild (already done automatically every 30 seconds). Only applicable to user accounts.
    */
   sync() {
+    if (!this.client.user.bot) {
       this.client.syncGuilds([this]);
     }
   }
+}
 
 module.exports = Guild;