diff --git a/Assets/Script/SDKManager/RushSDKManager.cs b/Assets/Script/SDKManager/RushSDKManager.cs
index bc860ed..a82079b 100644
--- a/Assets/Script/SDKManager/RushSDKManager.cs
+++ b/Assets/Script/SDKManager/RushSDKManager.cs
@@ -1052,7 +1052,7 @@ public class RushSDKManager : D_MonoSingleton<RushSDKManager>
         {
             return "GetSSAccountId";
         }
-        return null;
+        return "";
     }
 
     public string GetSSDistinctId()