From e2ba8d91c059dfac89a89ca8f0dd81ab22b3ccba Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 6 Apr 2007 19:38:22 +0000
Subject: [PATCH] Added extra check to prevent calling frame() when the window
 has been closed.

---
 examples/osgkeyboardmouse/osgkeyboardmouse.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/examples/osgkeyboardmouse/osgkeyboardmouse.cpp b/examples/osgkeyboardmouse/osgkeyboardmouse.cpp
index e6971d74a..6c1be534e 100644
--- a/examples/osgkeyboardmouse/osgkeyboardmouse.cpp
+++ b/examples/osgkeyboardmouse/osgkeyboardmouse.cpp
@@ -391,10 +391,13 @@ int main( int argc, char **argv )
     {
         gw->checkEvents();
         
-        viewer.frame();
+        if (gw->isRealized() && !exitHandler->done())
+        {      
+            viewer.frame();
 
-        // Swap Buffers
-        gw->swapBuffers();
+            // Swap Buffers
+            gw->swapBuffers();
+        }
     }
 
     return 0;