From f0a13f0530a244194486e95066f885b19787c5ea Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Wed, 25 Jul 2018 19:50:25 +0200
Subject: [PATCH] fix possible crash in Quarter viewer

---
 src/Gui/Quarter/SoQTQuarterAdaptor.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Gui/Quarter/SoQTQuarterAdaptor.cpp b/src/Gui/Quarter/SoQTQuarterAdaptor.cpp
index c207f9cc23..9eb530dc95 100644
--- a/src/Gui/Quarter/SoQTQuarterAdaptor.cpp
+++ b/src/Gui/Quarter/SoQTQuarterAdaptor.cpp
@@ -199,15 +199,15 @@ QWidget* SIM::Coin3D::Quarter::SoQTQuarterAdaptor::getGLWidget() const
 
 void SIM::Coin3D::Quarter::SoQTQuarterAdaptor::setCameraType(SoType type)
 {
-    if(!getSoRenderManager()->getCamera()->isOfType(SoPerspectiveCamera::getClassTypeId()) &&
-       !getSoRenderManager()->getCamera()->isOfType(SoOrthographicCamera::getClassTypeId())) {
+    SoCamera* cam = getSoRenderManager()->getCamera();
+    if (cam && !cam->isOfType(SoPerspectiveCamera::getClassTypeId()) &&
+               !cam->isOfType(SoOrthographicCamera::getClassTypeId())) {
         Base::Console().Warning("Quarter::setCameraType",
                                 "Only SoPerspectiveCamera and SoOrthographicCamera is supported.");
         return;
     }
 
 
-    SoCamera* cam = getSoRenderManager()->getCamera();
     SoType perspectivetype = SoPerspectiveCamera::getClassTypeId();
     SbBool oldisperspective = cam ? cam->getTypeId().isDerivedFrom(perspectivetype) : false;
     SbBool newisperspective = type.isDerivedFrom(perspectivetype);