From ff060d4f1f58298482f8b1f40e383f2a5839e50b Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Thu, 14 Jul 2016 17:14:10 +0200
Subject: [PATCH] + fix possible crash inside NavigationStyleP::viewAnimationCB
 if viewer has no camera node

---
 src/Gui/NavigationStyle.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Gui/NavigationStyle.cpp b/src/Gui/NavigationStyle.cpp
index 313f42b21..c49472ffa 100644
--- a/src/Gui/NavigationStyle.cpp
+++ b/src/Gui/NavigationStyle.cpp
@@ -463,6 +463,8 @@ void NavigationStyleP::viewAnimationCB(void * data, SoSensor * sensor)
         SbRotation slerp = SbRotation::slerp(that->spinRotation, PRIVATE(that)->endRotation, step);
         SbVec3f focalpoint = (1.0f-step)*PRIVATE(that)->focal1 + step*PRIVATE(that)->focal2;
         SoCamera* cam = that->viewer->getSoRenderManager()->getCamera();
+        if (!cam) return; // no camera
+
         SbVec3f direction;
         cam->orientation.setValue(slerp);
         cam->orientation.getValue().multVec(SbVec3f(0, 0, -1), direction);