From c3a87f75cd9620f59ea2a73a2739469e08d521ac Mon Sep 17 00:00:00 2001
From: Thomas Geymayer <tomgey@gmail.com>
Date: Thu, 25 Jul 2013 01:14:23 +0200
Subject: [PATCH] Canvas GUI: check for window on handling mouse events.

---
 src/Canvas/gui_mgr.cxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Canvas/gui_mgr.cxx b/src/Canvas/gui_mgr.cxx
index f3411d3bb..3188430e3 100644
--- a/src/Canvas/gui_mgr.cxx
+++ b/src/Canvas/gui_mgr.cxx
@@ -318,12 +318,12 @@ bool DesktopGroup::handleMouse(const osgGA::GUIEventAdapter& ea)
     assert(element->getUserData());
 
     canvas::WindowPtr window =
-      boost::static_pointer_cast<canvas::Window>
+      boost::dynamic_pointer_cast<canvas::Window>
       (
         static_cast<sc::Element::OSGUserData*>(element->getUserData())->element
       );
 
-    if( !window->isCapturingEvents() || !window->isVisible() )
+    if( !window || !window->isCapturingEvents() || !window->isVisible() )
       continue;
 
     float margin = window->isResizable() ? resize_margin_pos : 0;
-- 
2.39.5