From 2ab906bafd7e154bb9e333d7e76fe2a714478efd Mon Sep 17 00:00:00 2001
From: Martin Kiewitz
Date: Thu, 8 Oct 2009 21:00:21 +0000
Subject: SCI/newgui: RestoreBits() now ignores empty handles

svn-id: r44801
---
 engines/sci/gui/gui_gfx.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/engines/sci/gui/gui_gfx.cpp b/engines/sci/gui/gui_gfx.cpp
index d4fc056308..056bbecdc8 100644
--- a/engines/sci/gui/gui_gfx.cpp
+++ b/engines/sci/gui/gui_gfx.cpp
@@ -606,11 +606,15 @@ GuiMemoryHandle SciGuiGfx::SaveBits(const Common::Rect &rect, byte screenMask) {
 }
 
 void SciGuiGfx::RestoreBits(GuiMemoryHandle memoryHandle) {
-	byte *memoryPtr = kmem(_s->_segMan, memoryHandle);;
+	byte *memoryPtr = NULL;
 
-	if (memoryPtr) {
-		_screen->restoreBits(memoryPtr);
-		kfree(_s->_segMan, memoryHandle);
+	if (!memoryHandle.isNull()) {
+		memoryPtr = kmem(_s->_segMan, memoryHandle);;
+
+		if (memoryPtr) {
+			_screen->restoreBits(memoryPtr);
+			kfree(_s->_segMan, memoryHandle);
+		}
 	}
 }
 
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