diff --git a/shadowsocks-csharp/Controller/Strategy/SimplyChooseByStatisticsStrategy.cs b/shadowsocks-csharp/Controller/Strategy/SimplyChooseByStatisticsStrategy.cs
index 21a2666..faf86d2 100644
--- a/shadowsocks-csharp/Controller/Strategy/SimplyChooseByStatisticsStrategy.cs
+++ b/shadowsocks-csharp/Controller/Strategy/SimplyChooseByStatisticsStrategy.cs
@@ -93,6 +93,10 @@ namespace Shadowsocks.Controller.Strategy
 
         private void ChooseNewServer(List<Server> servers)
         {
+            if (statistics == null)
+            {
+                return;
+            }
             try
             {
                 var bestResult = (from server in servers