From 86fe4eade90bceddc2a02c9263e250ce98fa6795 Mon Sep 17 00:00:00 2001
From: James Tabor <james.tabor@reactos.org>
Date: Fri, 3 Jul 2009 08:03:56 +0000
Subject: [PATCH] - More Window Threads issues. Need to finish the window
 object rewrite!

svn path=/trunk/; revision=41753
---
 reactos/subsystems/win32/win32k/ntuser/vis.c    | 2 +-
 reactos/subsystems/win32/win32k/ntuser/winpos.c | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/reactos/subsystems/win32/win32k/ntuser/vis.c b/reactos/subsystems/win32/win32k/ntuser/vis.c
index 05c3583b7c0..0f30e35fbdb 100644
--- a/reactos/subsystems/win32/win32k/ntuser/vis.c
+++ b/reactos/subsystems/win32/win32k/ntuser/vis.c
@@ -43,7 +43,7 @@ VIS_ComputeVisibleRegion(
 
    Wnd = Window->Wnd;
 
-   if (!(Wnd->Style & WS_VISIBLE))
+   if (!Wnd || !(Wnd->Style & WS_VISIBLE))
    {
       return NULL;
    }
diff --git a/reactos/subsystems/win32/win32k/ntuser/winpos.c b/reactos/subsystems/win32/win32k/ntuser/winpos.c
index a94fe20e744..ba19166ed19 100644
--- a/reactos/subsystems/win32/win32k/ntuser/winpos.c
+++ b/reactos/subsystems/win32/win32k/ntuser/winpos.c
@@ -759,6 +759,9 @@ BOOL FASTCALL
 WinPosFixupFlags(WINDOWPOS *WinPos, PWINDOW_OBJECT Window)
 {
    PWINDOW Wnd = Window->Wnd;
+
+   if (!Wnd) return FALSE;
+
    if (Wnd->Style & WS_VISIBLE)
    {
       WinPos->flags &= ~SWP_SHOWWINDOW;