diff --git a/src/client/websocket/handlers/CHANNEL_RECIPIENT_ADD.js b/src/client/websocket/handlers/CHANNEL_RECIPIENT_ADD.js
index 443c31a..fc46539 100644
--- a/src/client/websocket/handlers/CHANNEL_RECIPIENT_ADD.js
+++ b/src/client/websocket/handlers/CHANNEL_RECIPIENT_ADD.js
@@ -9,6 +9,7 @@ module.exports = (client, packet) => {
    */
   const channel = client.channels.cache.get(packet.d.channel_id);
   if (!channel) return;
+  if (!channel._recipients) channel._recipients = [];
   channel._recipients.push(packet.d.user);
   const user = client.users._add(packet.d.user);
   client.emit(Events.CHANNEL_RECIPIENT_ADD, channel, user);
diff --git a/src/client/websocket/handlers/CHANNEL_RECIPIENT_REMOVE.js b/src/client/websocket/handlers/CHANNEL_RECIPIENT_REMOVE.js
index 6ba821c..5a2c917 100644
--- a/src/client/websocket/handlers/CHANNEL_RECIPIENT_REMOVE.js
+++ b/src/client/websocket/handlers/CHANNEL_RECIPIENT_REMOVE.js
@@ -9,6 +9,7 @@ module.exports = (client, packet) => {
    */
   const channel = client.channels.cache.get(packet.d.channel_id);
   if (!channel) return;
+  if (!channel._recipients) channel._recipients = [];
   channel._recipients = channel._recipients.filter(r => r !== packet.d.user.id);
   const user = client.users._add(packet.d.user);
   client.emit(Events.CHANNEL_RECIPIENT_REMOVE, channel, user);
diff --git a/src/structures/GuildMember.js b/src/structures/GuildMember.js
index c489550..45a6445 100644
--- a/src/structures/GuildMember.js
+++ b/src/structures/GuildMember.js
@@ -7,6 +7,7 @@ const TextBasedChannel = require('./interfaces/TextBasedChannel');
 const { Error } = require('../errors');
 const GuildMemberRoleManager = require('../managers/GuildMemberRoleManager');
 const Permissions = require('../util/Permissions');
+const Util = require('../util/Util');
 
 /**
  * @type {WeakSet<GuildMember>}
@@ -452,6 +453,34 @@ class GuildMember extends Base {
     return this.edit({ bio });
   }
 
+  /**
+   * Change Theme color
+   * @param {ColorResolvable} primary The primary color of the user's profile
+   * @param {ColorResolvable} accent The accent color of the user's profile
+   * @returns {Promise<GuildMember>}
+   */
+  async setThemeColors(primary, accent) {
+    if (this.user.id !== this.client.user.id) {
+      throw new Error('ONLY_ME');
+    }
+    if (!primary || !accent) throw new Error('PRIMARY_COLOR or ACCENT_COLOR are required.');
+    // Check nitro
+    if (this.nitroType !== 'NITRO_BOOST') {
+      throw new Error('NITRO_BOOST_REQUIRED', 'themeColors');
+    }
+    primary = Util.resolveColor(primary) || this.themeColors ? this.themeColors[0] : 0;
+    accent = Util.resolveColor(accent) || this.themeColors ? this.themeColors[1] : 0;
+    const data_ = await this.client.api.guilds[this.guild.id].profile['@me'].patch({
+      data: {
+        theme_colors: [primary, accent],
+      },
+    });
+    this._ProfilePatch({
+      guild_member_profile: data_,
+    });
+    return this;
+  }
+
   /**
    * Creates a DM channel between the client and this member.
    * @param {boolean} [force=false] Whether to skip the cache check and request the API
diff --git a/src/structures/PartialGroupDMChannel.js b/src/structures/PartialGroupDMChannel.js
index d09299a..ba5c45a 100644
--- a/src/structures/PartialGroupDMChannel.js
+++ b/src/structures/PartialGroupDMChannel.js
@@ -96,7 +96,7 @@ class PartialGroupDMChannel extends Channel {
    */
   _patch(data) {
     super._patch(data);
-    if ('recipients' in data) {
+    if ('recipients' in data && Array.isArray(data.recipients)) {
       this._recipients = data.recipients;
     }
     if ('last_pin_timestamp' in data) {
diff --git a/typings/index.d.ts b/typings/index.d.ts
index 0e95996..fabe447 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -1517,6 +1517,7 @@ export class GuildMember extends PartialTextBasedChannel(Base) {
   public toJSON(): unknown;
   public toString(): MemberMention;
   public valueOf(): string;
+  public setThemeColors(primary?: ColorResolvable, accent?: ColorResolvable): GuildMember;
 }
 
 export class GuildPreview extends Base {