diff --git a/Samples/ServiceAPI/CSharp/CORSModule/CORSModule.cs b/Samples/ServiceAPI/CSharp/CORSModule/CORSModule.cs
index a65c8f29..3eb55d03 100644
--- a/Samples/ServiceAPI/CSharp/CORSModule/CORSModule.cs
+++ b/Samples/ServiceAPI/CSharp/CORSModule/CORSModule.cs
@@ -21,7 +21,7 @@ public void Init(HttpApplication context)
         var originConfigs = ConfigurationManager.AppSettings["allowedOrigins"];
 
 
-        this.origins = (originConfigs ?? "").Split(',').Select(o => o.Trim()).ToArray();
+        this.origins = (originConfigs ?? "").Split(',').Select(o => o.Trim()).Where(o => !string.IsNullOrEmpty(o)).ToArray();
 
         context.PreSendRequestHeaders += delegate
         {