From 4d3df4cda6306569c3f2a2b87d51415854b1518a Mon Sep 17 00:00:00 2001
From: qianlifeng <qianlf2008@163.com>
Date: Fri, 27 Feb 2015 09:28:07 +0800
Subject: [PATCH] fix #256

---
 Wox.Infrastructure/FuzzyMatcher.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Wox.Infrastructure/FuzzyMatcher.cs b/Wox.Infrastructure/FuzzyMatcher.cs
index 5b0e144c8d..0da5c89a5e 100644
--- a/Wox.Infrastructure/FuzzyMatcher.cs
+++ b/Wox.Infrastructure/FuzzyMatcher.cs
@@ -32,6 +32,8 @@ namespace Wox.Infrastructure
 
         public MatchResult Evaluate(string str)
         {
+            if (string.IsNullOrEmpty(str) || string.IsNullOrEmpty(query)) return new MatchResult() { Success = false };
+
             var len = str.Length;
             var compareString = opt.IgnoreCase ? str.ToLower() : str;
             var pattern = opt.IgnoreCase ? query.ToLower() : query;