From 571a735f3a81a289ed28eccc843c42ba82cd4ac2 Mon Sep 17 00:00:00 2001
From: David Capello <davidcapello@gmail.com>
Date: Thu, 1 Apr 2010 00:08:08 -0300
Subject: [PATCH] Fixed somekind of bug (it could happen when we access to
 invalid memory).

---
 src/modules/gui.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/modules/gui.cpp b/src/modules/gui.cpp
index b4ad54cfd..4311bc88c 100644
--- a/src/modules/gui.cpp
+++ b/src/modules/gui.cpp
@@ -515,7 +515,7 @@ void gui_feedback()
 void gui_flip_screen()
 {
   /* double buffering? */
-  if (double_buffering && ji_screen) {
+  if (double_buffering && ji_screen && screen) {
     jmouse_draw_cursor();
 
     if (ji_dirty_region) {