diff --git a/packages/rocketchat-lib/server/functions/deleteUser.js b/packages/rocketchat-lib/server/functions/deleteUser.js
index ab7ec6719b9..035e40ef944 100644
--- a/packages/rocketchat-lib/server/functions/deleteUser.js
+++ b/packages/rocketchat-lib/server/functions/deleteUser.js
@@ -2,7 +2,7 @@ RocketChat.deleteUser = function(userId) {
 	const user = RocketChat.models.Users.findOneById(userId);
 
 	RocketChat.models.Messages.removeByUserId(userId); // Remove user messages
-	RocketChat.models.Subscriptions.findByUserId(userId).forEach((subscription) => {
+	RocketChat.models.Subscriptions.db.findByUserId(userId).forEach((subscription) => {
 		const room = RocketChat.models.Rooms.findOneById(subscription.rid);
 		if (room) {
 			if (room.t !== 'c' && room.usernames.length === 1) {
diff --git a/packages/rocketchat-livechat/.app/client/lib/chatMessages.js b/packages/rocketchat-livechat/.app/client/lib/chatMessages.js
index 1209391f61c..8323750505b 100644
--- a/packages/rocketchat-livechat/.app/client/lib/chatMessages.js
+++ b/packages/rocketchat-livechat/.app/client/lib/chatMessages.js
@@ -116,7 +116,7 @@ this.ChatMessages = class ChatMessages {
 			const currentAgent = !visitor.roomSubscribed && Livechat.agent;
 			if (currentAgent) {
 				agent = {
-					_id: currentAgent._id,
+					agentId: currentAgent._id,
 					username: currentAgent.username
 				};
 			}
diff --git a/packages/rocketchat-livechat/server/methods/sendMessageLivechat.js b/packages/rocketchat-livechat/server/methods/sendMessageLivechat.js
index 88a2ff58764..b04213c3ef6 100644
--- a/packages/rocketchat-livechat/server/methods/sendMessageLivechat.js
+++ b/packages/rocketchat-livechat/server/methods/sendMessageLivechat.js
@@ -7,6 +7,11 @@ Meteor.methods({
 		check(rid, String);
 		check(msg, String);
 
+		check(agent, Match.Maybe({
+			agentId: String,
+			username: String
+		}));
+
 		const guest = LivechatVisitors.getVisitorByToken(token, {
 			fields: {
 				name: 1,