From a821755936284e689534e00a8b539bc5d9a21be7 Mon Sep 17 00:00:00 2001
From: David Rose <david@ddrose.com>
Date: Wed, 5 Oct 2011 19:11:28 +0000
Subject: [PATCH] bandaid around race condition

---
 panda/src/display/graphicsEngine.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/panda/src/display/graphicsEngine.cxx b/panda/src/display/graphicsEngine.cxx
index d914b065e8..d89070cda3 100644
--- a/panda/src/display/graphicsEngine.cxx
+++ b/panda/src/display/graphicsEngine.cxx
@@ -1533,7 +1533,9 @@ draw_bins(const GraphicsEngine::Windows &wlist, Thread *current_thread) {
 void GraphicsEngine::
 draw_bins(GraphicsOutput *win, DisplayRegion *dr, Thread *current_thread) {
   GraphicsStateGuardian *gsg = win->get_gsg();
-  nassertv(gsg != (GraphicsStateGuardian *)NULL);
+  if (gsg == (GraphicsStateGuardian *)NULL) {
+    return;
+  }
 
   PT(CullResult) cull_result = dr->get_cull_result(current_thread);
   PT(SceneSetup) scene_setup = dr->get_scene_setup(current_thread);