diff --git a/MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitterGraphics.c b/MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitterGraphics.c
index f01e0a7b8d..5b11f2114b 100644
--- a/MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitterGraphics.c
+++ b/MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitterGraphics.c
@@ -1,7 +1,7 @@
 /** @file
   Support for Graphics output spliter.
   
-Copyright (c) 2006 - 2009, Intel Corporation. <BR>
+Copyright (c) 2006 - 2010, Intel Corporation. <BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -239,6 +239,10 @@ ConSplitterGraphicsOutputBlt (
   EFI_GRAPHICS_OUTPUT_PROTOCOL    *GraphicsOutput;
   EFI_UGA_DRAW_PROTOCOL           *UgaDraw;
 
+  if (This == NULL || ((UINTN) BltOperation) >= EfiGraphicsOutputBltOperationMax) {
+    return EFI_INVALID_PARAMETER;
+  }
+  
   Private = GRAPHICS_OUTPUT_SPLITTER_PRIVATE_DATA_FROM_THIS (This);
 
   ReturnStatus = EFI_SUCCESS;