diff --git a/Netch/Forms/Mode/Process.cs b/Netch/Forms/Mode/Process.cs
index 546cd5f7..15eecdf1 100644
--- a/Netch/Forms/Mode/Process.cs
+++ b/Netch/Forms/Mode/Process.cs
@@ -24,7 +24,7 @@ namespace Netch.Forms.Mode
         /// <param name="mode">模式</param>
         public Process(Models.Mode mode = null)
         {
-            if ((mode?.Type ?? 0) is not 0)
+            if (mode != null && mode.Type is not 0)
                 throw new ArgumentOutOfRangeException();
 
             InitializeComponent();
diff --git a/Netch/Forms/Mode/Route.cs b/Netch/Forms/Mode/Route.cs
index b66dedc5..d6f44f02 100644
--- a/Netch/Forms/Mode/Route.cs
+++ b/Netch/Forms/Mode/Route.cs
@@ -34,7 +34,7 @@ namespace Netch.Forms.Mode
 
         public Route(Models.Mode mode = null)
         {
-            if ((mode?.Type ?? 1) is not (1 or 2))
+            if (mode != null && mode.Type is not (1 or 2))
                 throw new ArgumentOutOfRangeException();
 
             _mode = mode;