From 3deb3adee6a750caca115bd3715d47720463691f Mon Sep 17 00:00:00 2001
From: Thomas Bluemel <thomas@reactsoft.com>
Date: Fri, 12 Dec 2003 16:56:20 +0000
Subject: [PATCH] don't unlink a window that has no parent window

svn path=/trunk/; revision=6970
---
 reactos/subsys/win32k/ntuser/window.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/reactos/subsys/win32k/ntuser/window.c b/reactos/subsys/win32k/ntuser/window.c
index 9b1d2af5d30..41a8966a15e 100644
--- a/reactos/subsys/win32k/ntuser/window.c
+++ b/reactos/subsys/win32k/ntuser/window.c
@@ -16,7 +16,7 @@
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
-/* $Id: window.c,v 1.157 2003/12/12 14:22:37 gvg Exp $
+/* $Id: window.c,v 1.158 2003/12/12 16:56:20 weiden Exp $
  *
  * COPYRIGHT:        See COPYING in the top level directory
  * PROJECT:          ReactOS kernel
@@ -358,9 +358,12 @@ static LRESULT IntDestroyWindow(PWINDOW_OBJECT Window,
   CLASS_RemoveWindow(Window->Class);
 #endif
 
-  ExAcquireFastMutexUnsafe(&Window->Parent->ChildrenListLock);
-  IntUnlinkWindow(Window);
-  ExReleaseFastMutexUnsafe(&Window->Parent->ChildrenListLock);
+  if(Window->Parent)
+  {
+    ExAcquireFastMutexUnsafe(&Window->Parent->ChildrenListLock);
+    IntUnlinkWindow(Window);
+    ExReleaseFastMutexUnsafe(&Window->Parent->ChildrenListLock);
+  }
 
   ExAcquireFastMutexUnsafe (&ThreadData->WindowListLock);
   RemoveEntryList(&Window->ThreadListEntry);