diff --git a/Wox/App.config b/Wox/App.config
index 55ab1e0d9d..c718ae367c 100644
--- a/Wox/App.config
+++ b/Wox/App.config
@@ -1,10 +1,5 @@
 <?xml version="1.0"?>
 <configuration>
-  <runtime>
-    <!--http://stackoverflow.com/questions/186854/how-to-prevent-an-exception-in-a-background-thread-from-terminating-an-application-->
-    <!--prevent non-ui exception crash wox-->
-    <legacyUnhandledExceptionPolicy enabled="1" />
-  </runtime>
   <startup>
     <supportedRuntime version="v2.0.50727" />
     <supportedRuntime version="v4.0" />
diff --git a/Wox/App.xaml.cs b/Wox/App.xaml.cs
index 5b239e0851..4e87e6a4db 100644
--- a/Wox/App.xaml.cs
+++ b/Wox/App.xaml.cs
@@ -42,7 +42,7 @@ namespace Wox
 
         }
 
-        [Conditional("DEBUG")]
+        [Conditional("RELEASE")]
         private void RegisterUnhandledException()
         {
             // let exception throw as normal is better for Debug
diff --git a/Wox/Wox.csproj b/Wox/Wox.csproj
index 7d46e6109a..cd72afb976 100644
--- a/Wox/Wox.csproj
+++ b/Wox/Wox.csproj
@@ -48,7 +48,7 @@
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>..\Output\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
+    <DefineConstants>TRACE;RELEASE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <Prefer32Bit>false</Prefer32Bit>