diff --git a/src/event-handlers/activityHandler.js b/src/event-handlers/activityHandler.js
index e114f692..e14de85d 100644
--- a/src/event-handlers/activityHandler.js
+++ b/src/event-handlers/activityHandler.js
@@ -6,7 +6,7 @@ module.exports = (io, socket, usersOnline) => {
   }
 
   const disconnect = () => {
-    if (socket.user) {
+    if (socket.user && !io.sockets.adapter.rooms.has(socket.user.id)) {
       usersOnline.delete(socket.user.id)
       io.emit('usersOnline', Array.from(usersOnline))
     }
diff --git a/src/test/unit/event-handlers/activityHandler.spec.js b/src/test/unit/event-handlers/activityHandler.spec.js
index 21506365..b3a49873 100644
--- a/src/test/unit/event-handlers/activityHandler.spec.js
+++ b/src/test/unit/event-handlers/activityHandler.spec.js
@@ -4,7 +4,7 @@ describe('activityHandler', () => {
   let io, socket, usersOnline
 
   beforeEach(() => {
-    io = { emit: jest.fn() }
+    io = { emit: jest.fn(), sockets: { adapter: { rooms: new Map() } } }
     socket = {
       join: jest.fn(),
       on: jest.fn(),
@@ -36,6 +36,18 @@ describe('activityHandler', () => {
     expect(io.emit).toHaveBeenCalledWith('usersOnline', Array.from(usersOnline))
   })
 
+  test('should not delete the user from usersOnline when the user has at least one active session', () => {
+    usersOnline.add('user1')
+    io.sockets.adapter.rooms.set('user1', 'socketId')
+
+    const disconnectCallback = socket.on.mock.calls.find(([event]) => event === 'disconnect')[1]
+
+    disconnectCallback()
+
+    expect(usersOnline.has('user1')).toBe(true)
+    expect(io.emit).not.toHaveBeenCalled()
+  })
+
   test('should call disconnect and do nothing if socket.user is undefined', () => {
     socket.user = undefined