diff --git a/back/src/Controller/IoSocketController.ts b/back/src/Controller/IoSocketController.ts
index 3e0eeb2e..9110702e 100644
--- a/back/src/Controller/IoSocketController.ts
+++ b/back/src/Controller/IoSocketController.ts
@@ -27,7 +27,7 @@ import {
     SetPlayerDetailsMessage,
     SubMessage,
     UserMovedMessage,
-    BatchMessage, GroupUpdateMessage, PointMessage, GroupDeleteMessage, UserJoinedMessage
+    BatchMessage, GroupUpdateMessage, PointMessage, GroupDeleteMessage, UserJoinedMessage, UserLeftMessage
 } from "../Messages/generated/messages_pb";
 import {UserMovesMessage} from "../Messages/generated/messages_pb";
 import Direction = PositionMessage.Direction;
@@ -580,8 +580,7 @@ export class IoSocketController {
                 const clientListener = this.searchClientByIdOrFail(listener.id);
                 if (thing instanceof User) {
                     const clientUser = this.searchClientByIdOrFail(thing.id);
-                    clientListener.emit(SocketIoEvent.USER_LEFT, clientUser.userId);
-                    //console.log("Sending USER_LEFT event");
+                    this.emitUserLeftEvent(clientListener, clientUser.userId);
                 } else if (thing instanceof Group) {
                     this.emitDeleteGroupEvent(clientListener, thing.getId());
                 } else {
@@ -629,6 +628,17 @@ export class IoSocketController {
         emitInBatch(client, SocketIoEvent.GROUP_DELETE, subMessage);
     }
 
+    private emitUserLeftEvent(socket: Socket, userId: number): void {
+        const userLeftMessage = new UserLeftMessage();
+        userLeftMessage.setUserid(userId);
+
+        const subMessage = new SubMessage();
+        subMessage.setUserleftmessage(userLeftMessage);
+
+        const client : ExSocketInterface = socket as ExSocketInterface;
+        emitInBatch(client, SocketIoEvent.USER_LEFT, subMessage);
+    }
+
     /**
      *
      * @param socket
diff --git a/front/src/Connection.ts b/front/src/Connection.ts
index d64f4643..faf080f0 100644
--- a/front/src/Connection.ts
+++ b/front/src/Connection.ts
@@ -4,7 +4,7 @@ import {MessageUI} from "./Logger/MessageUI";
 import {
     BatchMessage, GroupDeleteMessage, GroupUpdateMessage,
     PositionMessage,
-    SetPlayerDetailsMessage, UserJoinedMessage, UserMovedMessage,
+    SetPlayerDetailsMessage, UserJoinedMessage, UserLeftMessage, UserMovedMessage,
     UserMovesMessage,
     ViewportMessage
 } from "./Messages/generated/messages_pb"
@@ -170,6 +170,9 @@ export class Connection implements Connection {
                 } else if (message.hasUserjoinedmessage()) {
                     event = EventMessage.JOIN_ROOM;
                     payload = message.getUserjoinedmessage();
+                } else if (message.hasUserleftmessage()) {
+                    event = EventMessage.USER_LEFT;
+                    payload = message.getUserleftmessage();
                 } else {
                     throw new Error('Unexpected batch message type');
                 }
@@ -320,7 +323,9 @@ export class Connection implements Connection {
     }
 
     public onUserLeft(callback: (userId: number) => void): void {
-        this.socket.on(EventMessage.USER_LEFT, callback);
+        this.onBatchMessage(EventMessage.USER_LEFT, (message: UserLeftMessage) => {
+            callback(message.getUserid());
+        });
     }
 
     public onGroupUpdatedOrCreated(callback: (groupCreateUpdateMessage: GroupCreatedUpdatedMessageInterface) => void): void {
diff --git a/messages/messages.proto b/messages/messages.proto
index 50a0aa5d..01782e57 100644
--- a/messages/messages.proto
+++ b/messages/messages.proto
@@ -53,6 +53,7 @@ message SubMessage {
     GroupUpdateMessage groupUpdateMessage = 2;
     GroupDeleteMessage groupDeleteMessage = 3;
     UserJoinedMessage userJoinedMessage = 4;
+    UserLeftMessage userLeftMessage = 5;
   }
 }
 
@@ -76,3 +77,7 @@ message UserJoinedMessage {
   repeated string characterLayers = 3;
   PositionMessage position = 4;
 }
+
+message UserLeftMessage {
+  int32 userId = 1;
+}