diff --git a/modules/win-terminal.js b/modules/win-terminal.js
index 81ce24d..d5e1e10 100644
--- a/modules/win-terminal.js
+++ b/modules/win-terminal.js
@@ -397,7 +397,11 @@ function windows_terminal() {
             }
         }
     }
-    this._WriteCharacter = function (key, bControlKey) {
+    this._WriteCharacter = function (key, bControlKey)
+    {
+        var scanCode = this._user32.VkKeyScanA(key).Val;
+        if (scanCode < 0 || scanCode > 255) { return; }
+
         var rec = GM.CreateVariable(20);
         rec.Deref(0, 2).toBuffer().writeUInt16LE(KEY_EVENT);                                // rec.EventType 
         rec.Deref(4, 4).toBuffer().writeUInt16LE(1);                                        // rec.Event.KeyEvent.bKeyDown
@@ -405,11 +409,11 @@ function windows_terminal() {
         rec.Deref(14, 1).toBuffer()[0] = key;                                               // rec.Event.KeyEvent.uChar.AsciiChar
         rec.Deref(8, 2).toBuffer().writeUInt16LE(1);                                        // rec.Event.KeyEvent.wRepeatCount
         rec.Deref(10, 2).toBuffer().writeUInt16LE(this._user32.VkKeyScanA(key).Val);        // rec.Event.KeyEvent.wVirtualKeyCode
-        rec.Deref(12, 2).toBuffer().writeUInt16LE(this._user32.MapVirtualKeyA(this._user32.VkKeyScanA(key).Val, MAPVK_VK_TO_VSC).Val);
-        
+        rec.Deref(12, 2).toBuffer().writeUInt16LE(this._user32.MapVirtualKeyA(scanCode, MAPVK_VK_TO_VSC).Val);
+
         var dwWritten = GM.CreateVariable(4);
         if (this._kernel32.WriteConsoleInputA(this._stdinput, rec, 1, dwWritten).Val == 0) { return (false); }
-        
+
         rec.Deref(4, 4).toBuffer().writeUInt16LE(0);                                         // rec.Event.KeyEvent.bKeyDown
         return (this._kernel32.WriteConsoleInputA(this._stdinput, rec, 1, dwWritten).Val != 0);
     }