From 1196696ed7c1c87c9dbbe296975254cc30fb6ec5 Mon Sep 17 00:00:00 2001
From: icylogic <withguohao@gmail.com>
Date: Tue, 8 Dec 2015 22:53:29 +0800
Subject: [PATCH] fix #389: crash on empty statistic data.

---
 shadowsocks-csharp/View/StatisticsStrategyConfigurationForm.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/shadowsocks-csharp/View/StatisticsStrategyConfigurationForm.cs b/shadowsocks-csharp/View/StatisticsStrategyConfigurationForm.cs
index 88e32309..028f1099 100644
--- a/shadowsocks-csharp/View/StatisticsStrategyConfigurationForm.cs
+++ b/shadowsocks-csharp/View/StatisticsStrategyConfigurationForm.cs
@@ -85,6 +85,9 @@ namespace Shadowsocks.View
         {
             string serverName = _servers[serverSelector.SelectedIndex];
             _dataTable.Rows.Clear();
+
+            //return directly when no data is usable
+            if (_controller.availabilityStatistics?.FilteredStatistics == null) return;
             List<AvailabilityStatistics.RawStatisticsData> statistics;
             if (!_controller.availabilityStatistics.FilteredStatistics.TryGetValue(serverName, out statistics)) return;
             IEnumerable<IGrouping<int, AvailabilityStatistics.RawStatisticsData>> dataGroups;