diff --git a/Wox.Infrastructure/Wox.cs b/Wox.Infrastructure/Wox.cs
index b5abd88f98..dcad17d7f3 100644
--- a/Wox.Infrastructure/Wox.cs
+++ b/Wox.Infrastructure/Wox.cs
@@ -11,14 +11,14 @@ namespace Wox.Infrastructure
         public const string Plugins = "Plugins";
 
         private static readonly Assembly Assembly = Assembly.GetExecutingAssembly();
-        public static readonly string ProgramDirectory = Directory.GetParent(Assembly.Location).ToString();
+        public static readonly string ProgramDirectory = Directory.GetParent(Assembly.Location.NonNull()).ToString();
         public static readonly string ExecutablePath = Path.Combine(ProgramDirectory, Wox + ".exe");
         public static readonly string DataDirectory = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), Wox);
         public static readonly string PluginsDirectory = Path.Combine(DataDirectory, Plugins);
         public static readonly string PreinstalledDirectory = Path.Combine(ProgramDirectory, Plugins);
         public const string Repository = "https://github.com/Wox-launcher/Wox";
         public const string Issue = "https://github.com/Wox-launcher/Wox/issues/new";
-        public static readonly string Version = FileVersionInfo.GetVersionInfo(Assembly.Location).ProductVersion;
+        public static readonly string Version = FileVersionInfo.GetVersionInfo(Assembly.Location.NonNull()).ProductVersion;
 
         public static readonly string DefaultIcon = Path.Combine(ProgramDirectory, "Images", "app.png");
         public static readonly string ErrorIcon = Path.Combine(ProgramDirectory, "Images", "app_error.png");