From c53313ac6ed1f1d11f2a2ca912cfc38596a28f50 Mon Sep 17 00:00:00 2001
From: Albrecht Schlosser <albrechts.fltk@online.de>
Date: Mon, 6 Jun 2011 09:37:21 +0000
Subject: Fix potential NULL pointer dereference, if !XineramaIsActive(...).

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@8783 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/screen_xywh.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/screen_xywh.cxx b/src/screen_xywh.cxx
index f1e9dd52a..21e4e5eb9 100644
--- a/src/screen_xywh.cxx
+++ b/src/screen_xywh.cxx
@@ -259,7 +259,7 @@ void Fl::screen_xywh(int &X, int &Y, int &W, int &H, int n) {
   }
 #else
 #if HAVE_XINERAMA
-  if (num_screens > 0) {
+  if (num_screens > 0 && screens) {
     X = screens[n].x_org;
     Y = screens[n].y_org;
     W = screens[n].width;
-- 
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