diff --git a/lib/structures/GuildChannel.js b/lib/structures/GuildChannel.js
index 51acb7ad9..5c3bf2264 100644
--- a/lib/structures/GuildChannel.js
+++ b/lib/structures/GuildChannel.js
@@ -5,6 +5,7 @@ const Collection = require("../util/Collection");
 const Permission = require("./Permission");
 const {Permissions} = require("../Constants");
 const PermissionOverwrite = require("./PermissionOverwrite");
+const ThreadChannel = require("./ThreadChannel");
 
 /**
 * Represents a guild channel. You also probably want to look at CategoryChannel, NewsChannel, StoreChannel, TextChannel, and VoiceChannel. See Channel for extra properties.
@@ -127,20 +128,21 @@ class GuildChannel extends Channel {
         if(permission & Permissions.administrator) {
             return new Permission(Permissions.all);
         }
-        let overwrite = this.permissionOverwrites.get(this.guild.id);
+        const channel = this instanceof ThreadChannel ? this.guild.channels.get(this.parentID) : this;
+        let overwrite = channel && channel.permissionOverwrites.get(this.guild.id);
         if(overwrite) {
             permission = (permission & ~overwrite.deny) | overwrite.allow;
         }
         let deny = 0n;
         let allow = 0n;
         for(const roleID of member.roles) {
-            if((overwrite = this.permissionOverwrites.get(roleID))) {
+            if((overwrite = channel && channel.permissionOverwrites.get(roleID))) {
                 deny |= overwrite.deny;
                 allow |= overwrite.allow;
             }
         }
         permission = (permission & ~deny) | allow;
-        overwrite = this.permissionOverwrites.get(member.id);
+        overwrite = channel && channel.permissionOverwrites.get(member.id);
         if(overwrite) {
             permission = (permission & ~overwrite.deny) | overwrite.allow;
         }