diff --git a/index.js b/index.js
index 2998ade..46dcd3f 100644
--- a/index.js
+++ b/index.js
@@ -237,7 +237,7 @@ module.exports.categories = {
 						}
 						const data = [
 							"subscribe",
-							categoriesID
+							[categoriesID]
 						];
 
 						socket.send(`42/gateway,${JSON.stringify(data)}`);
@@ -293,7 +293,11 @@ module.exports.categories = {
 							}
 							case "clientListUpdate": {
 								const categoryID = data[1].category._id;
+								if (!categories[categoryID])
+									categories[categoryID] = {};
+
 								const callback = categories[categoryID].updateCallback;
+
 								if (callback) {
 									categories[categoryID].updateCallback = null;
 									callback(categoryID);