From 816777c79aed4f8041d53307751d28ba59e52a10 Mon Sep 17 00:00:00 2001
From: James Tabor <james.tabor@reactos.org>
Date: Wed, 16 Jul 2008 16:12:44 +0000
Subject: [PATCH] - Fix CurrentWnd when it has a NULL, see Bug 3527.

svn path=/trunk/; revision=34550
---
 reactos/subsystems/win32/win32k/ntuser/vis.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/reactos/subsystems/win32/win32k/ntuser/vis.c b/reactos/subsystems/win32/win32k/ntuser/vis.c
index d89a1348097..50a1e2cf9ae 100644
--- a/reactos/subsystems/win32/win32k/ntuser/vis.c
+++ b/reactos/subsystems/win32/win32k/ntuser/vis.c
@@ -69,7 +69,7 @@ VIS_ComputeVisibleRegion(
    while (CurrentWindow)
    {
       CurrentWnd = CurrentWindow->Wnd;
-      if (!(CurrentWnd->Style & WS_VISIBLE))
+      if (!(CurrentWnd) || !(CurrentWnd->Style & WS_VISIBLE))
       {
          NtGdiDeleteObject(VisRgn);
          return NULL;