diff --git a/Unity/Assets/Scripts/Core/World/Singleton.cs b/Unity/Assets/Scripts/Core/World/Singleton.cs
index 51aacbdb1d6..bfd400ac61f 100644
--- a/Unity/Assets/Scripts/Core/World/Singleton.cs
+++ b/Unity/Assets/Scripts/Core/World/Singleton.cs
@@ -17,6 +17,7 @@ public abstract class Singleton<T>: ASingleton where T: Singleton<T>
         [StaticField]
         private static T instance;
         
+        [StaticField]
         public static T Instance
         {
             get
diff --git a/Unity/Assets/Scripts/Core/World/World.cs b/Unity/Assets/Scripts/Core/World/World.cs
index 0eac1af6310..f7bd51d7fe0 100644
--- a/Unity/Assets/Scripts/Core/World/World.cs
+++ b/Unity/Assets/Scripts/Core/World/World.cs
@@ -8,6 +8,7 @@ public class World: IDisposable
         [StaticField]
         private static World instance;
 
+        [StaticField]
         public static World Instance
         {
             get
diff --git a/Unity/Assets/Scripts/Model/Share/Module/Message/Session.cs b/Unity/Assets/Scripts/Model/Share/Module/Message/Session.cs
index 829e68cddf3..aa5f59ff61e 100644
--- a/Unity/Assets/Scripts/Model/Share/Module/Message/Session.cs
+++ b/Unity/Assets/Scripts/Model/Share/Module/Message/Session.cs
@@ -66,7 +66,7 @@ public static void OnResponse(this Session self, IResponse response)
         
         public static async ETTask<IResponse> Call(this Session self, IRequest request, ETCancellationToken cancellationToken)
         {
-            int rpcId = ++Session.RpcId;
+            int rpcId = ++self.RpcId;
             RpcInfo rpcInfo = new RpcInfo(request);
             self.requestCallbacks[rpcId] = rpcInfo;
             request.RpcId = rpcId;
@@ -102,7 +102,7 @@ void CancelAction()
 
         public static async ETTask<IResponse> Call(this Session self, IRequest request, int time = 0)
         {
-            int rpcId = ++Session.RpcId;
+            int rpcId = ++self.RpcId;
             RpcInfo rpcInfo = new(request);
             self.requestCallbacks[rpcId] = rpcInfo;
             request.RpcId = rpcId;
@@ -150,7 +150,7 @@ public sealed class Session: Entity, IAwake<AService>, IDestroy
     {
         public AService AService { get; set; }
         
-        public static int RpcId
+        public int RpcId
         {
             get;
             set;