bug fix

v2rayN/v2rayN/Forms/MainForm.cs

@@ -1006,10 +1006,13 @@ namespace v2rayN.Forms
         #region 后台测速
 
         private void SetTestResult(int k, string txt)
+        {
+            if (k < lvServers.Items.Count)
             {
                 config.vmess[k].testResult = txt;
                 lvServers.Items[k].SubItems["testResult"].Text = txt;
             }
+        }
         private void ClearTestResult()
         {
             foreach (int s in lvSelecteds)