From 1c44bb215761366278902e794ff1c9af64012ead Mon Sep 17 00:00:00 2001
From: Clemens Zeidler <clemens.zeidler@googlemail.com>
Date: Tue, 2 Aug 2011 22:20:12 +0000
Subject: [PATCH] Check if the dirty region is valid. Part of #7896.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42547 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 src/servers/app/decorator/DefaultDecorator.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/servers/app/decorator/DefaultDecorator.cpp b/src/servers/app/decorator/DefaultDecorator.cpp
index 0dc34cdd5d..7b07782169 100644
--- a/src/servers/app/decorator/DefaultDecorator.cpp
+++ b/src/servers/app/decorator/DefaultDecorator.cpp
@@ -1247,7 +1247,8 @@ DefaultDecorator::_ResizeBy(BPoint offset, BRegion* dirty)
 	if (fTitleBarRect.IsValid()) {
 		if (fTabList.CountItems() > 1) {
 			_DoTabLayout();
-			dirty->Include(fTitleBarRect);
+			if (dirty != NULL)
+				dirty->Include(fTitleBarRect);
 			return;
 		}