From cd34db49025aa74a5575c30f7c4f193580c97708 Mon Sep 17 00:00:00 2001
From: brianp <brianp@7f0cb862-5218-0410-a997-914c9d46530a>
Date: Wed, 16 Feb 2005 00:49:28 +0000
Subject: [PATCH] added error check (John Fay)

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@569 7f0cb862-5218-0410-a997-914c9d46530a
---
 freeglut/freeglut/src/freeglut_callbacks.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/freeglut/freeglut/src/freeglut_callbacks.c b/freeglut/freeglut/src/freeglut_callbacks.c
index f1f4b90..2dd2232 100644
--- a/freeglut/freeglut/src/freeglut_callbacks.c
+++ b/freeglut/freeglut/src/freeglut_callbacks.c
@@ -131,6 +131,7 @@ static void fghVisibility( int status )
 {
     int glut_status = GLUT_VISIBLE;
 
+    FREEGLUT_INTERNAL_ERROR_EXIT_IF_NOT_INITIALISED ( "Visibility Callback" );
     freeglut_return_if_fail( fgStructure.Window );
 
     if( ( GLUT_HIDDEN == status )  || ( GLUT_FULLY_COVERED == status ) )