Resolve the user first

commands/owner/ublacklist.js

@@ -33,7 +33,10 @@ export default {
 			const body = { type:command, uid: userid, reason: reason };
 			Blacklists.create(body);
 			let user = userid;
-			if (command !== 'guild') {user = client.users.fetch(userid).tag;}
+			if (command !== 'guild') {
+				await client.users.resolve(userid);
+				user = client.users.fetch(userid).tag;
+			}
 
 			return interaction.editReply(`${user} has been blacklisted from ${command} with the following reason ${reason}`);
 		}