From 51a7d5d08a3dc00ec3c83f4491be0436a4098096 Mon Sep 17 00:00:00 2001
From: fmarcac <188743521+fmarcac@users.noreply.github.com>
Date: Sat, 5 Sep 2026 14:24:48 +0200
Subject: Fix SyncPlay active session counter leaking on rejoin

---
 Emby.Server.Implementations/SyncPlay/SyncPlayManager.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'Emby.Server.Implementations')

diff --git a/Emby.Server.Implementations/SyncPlay/SyncPlayManager.cs b/Emby.Server.Implementations/SyncPlay/SyncPlayManager.cs
index b45d754554..a2b9088708 100644
--- a/Emby.Server.Implementations/SyncPlay/SyncPlayManager.cs
+++ b/Emby.Server.Implementations/SyncPlay/SyncPlayManager.cs
@@ -181,8 +181,8 @@ namespace Emby.Server.Implementations.SyncPlay
                     {
                         if (existingGroup.GroupId.Equals(request.GroupId))
                         {
-                            // Restore session.
-                            UpdateSessionsCounter(session.UserId, 1);
+                            // Restore session. The session is already in the group and has already
+                            // been counted, so the counter must not be incremented a second time.
                             group.SessionJoin(session, request, cancellationToken);
                             return;
                         }
@@ -400,7 +400,7 @@ namespace Emby.Server.Implementations.SyncPlay
             // Update sessions counter.
             var newSessionsCounter = _activeUsers.AddOrUpdate(
                 userId,
-                1,
+                toAdd,
                 (_, sessionsCounter) => sessionsCounter + toAdd);
 
             // Should never happen.
-- 
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