diff --git a/Assets/Scripts/FogOfWarSystem.cs b/Assets/Scripts/FogOfWarSystem.cs
index 9614238..fd27d62 100644
--- a/Assets/Scripts/FogOfWarSystem.cs
+++ b/Assets/Scripts/FogOfWarSystem.cs
@@ -355,7 +355,7 @@ namespace Northbound
 
                 Vector3 position = provider.GetTransform().position;
                 float visionRange = provider.GetVisionRange();
-                
+
                 RevealArea(ownerId, position, visionRange);
             }
 
@@ -365,11 +365,18 @@ namespace Northbound
                 ulong clientId = kvp.Key;
                 FogOfWarData fogData = kvp.Value;
 
+                // 해당 클라이언트가 여전히 연결되어 있는지 확인
+                if (NetworkManager.Singleton == null ||
+                    !NetworkManager.Singleton.ConnectedClients.ContainsKey(clientId))
+                {
+                    continue;
+                }
+
                 // 압축된 데이터로 전송
                 byte[] visibleData = fogData.GetVisibleData();
                 byte[] exploredData = fogData.GetExploredData();
 
-                SendFogDataToClientRpc(visibleData, exploredData, 
+                SendFogDataToClientRpc(visibleData, exploredData,
                     new ClientRpcParams
                     {
                         Send = new ClientRpcSendParams
diff --git a/Assets/Scripts/PlayerVisionProvider.cs b/Assets/Scripts/PlayerVisionProvider.cs
index 46f9799..17c8c88 100644
--- a/Assets/Scripts/PlayerVisionProvider.cs
+++ b/Assets/Scripts/PlayerVisionProvider.cs
@@ -9,10 +9,12 @@ namespace Northbound
     public class PlayerVisionProvider : NetworkBehaviour, IVisionProvider
     {
         private PlayerStats _playerStats;
+        private NetworkPlayerController _playerController;
 
         public override void OnNetworkSpawn()
         {
             _playerStats = GetComponent<PlayerStats>();
+            _playerController = GetComponent<NetworkPlayerController>();
             if (IsServer)
             {
                 FogOfWarSystem.Instance?.RegisterVisionProvider(this);
@@ -27,7 +29,9 @@ namespace Northbound
             }
         }
 
-        public ulong GetOwnerId() => OwnerClientId;
+        // NetworkPlayerController.OwnerPlayerId 사용 (실제 플레이어 ID)
+        // OwnerClientId는 서버 소유권이므로 잘못된 ID 반환
+        public ulong GetOwnerId() => _playerController?.OwnerPlayerId ?? OwnerClientId;
         public float GetVisionRange() => _playerStats?.GetSight() ?? 10f;
         public Transform GetTransform() => transform;
         public bool IsActive() => IsSpawned;