diff --git a/app/ui-sidenav/client/roomList.js b/app/ui-sidenav/client/roomList.js
index f6a062df8d7d..18627691d100 100644
--- a/app/ui-sidenav/client/roomList.js
+++ b/app/ui-sidenav/client/roomList.js
@@ -144,7 +144,7 @@ const getLowerCaseNames = (room, nameDefault = '', fnameDefault = '') => {
 const mergeSubRoom = (subscription) => {
 	const room = Rooms.findOne(subscription.rid) || { _updatedAt: subscription.ts };
 	subscription.lastMessage = room.lastMessage;
-	subscription.lm = room._updatedAt;
+	subscription.lm = (room.lastMessage && room.lastMessage.ts) || room._updatedAt;
 	subscription.streamingOptions = room.streamingOptions;
 	return Object.assign(subscription, getLowerCaseNames(subscription));
 };
@@ -160,7 +160,7 @@ const mergeRoomSub = (room) => {
 	}, {
 		$set: {
 			lastMessage: room.lastMessage,
-			lm: room._updatedAt,
+			lm: (room.lastMessage && room.lastMessage.ts) || room._updatedAt,
 			streamingOptions: room.streamingOptions,
 			...getLowerCaseNames(room, sub.name, sub.fname),
 		},
diff --git a/server/startup/migrations/index.js b/server/startup/migrations/index.js
index 60ee4afe9979..948bc590af93 100644
--- a/server/startup/migrations/index.js
+++ b/server/startup/migrations/index.js
@@ -180,4 +180,5 @@ import './v179';
 import './v180';
 import './v181';
 import './v182';
+import './v183';
 import './xrun';
diff --git a/server/startup/migrations/v183.js b/server/startup/migrations/v183.js
new file mode 100644
index 000000000000..1a4e4b63be2d
--- /dev/null
+++ b/server/startup/migrations/v183.js
@@ -0,0 +1,21 @@
+import { Migrations } from '../../../app/migrations';
+import { Subscriptions, Rooms } from '../../../app/models';
+
+Migrations.add({
+	version: 183,
+	up() {
+		const subscriptions = Subscriptions.find({}).fetch();
+
+		subscriptions.forEach((subscription) => {
+			const room = Rooms.findOneById(subscription.rid);
+
+			Subscriptions.update({
+				_id: subscription._id,
+			}, {
+				$set: {
+					lm: (room.lastMessage && room.lastMessage.ts) || subscription._updatedAt,
+				},
+			});
+		});
+	},
+});