Fix a crash where we show a message-box on start.

Don't assume we got as far as creating a viewer when destroying
the renderer.

diff --git a/src/Viewer/renderer.cxx b/src/Viewer/renderer.cxx
index cc47f80b3b83b83376693cd2608e14ec53276a98..d982056e0b4e9e05f90223f81549484acef8e8be 100644 (file)
--- a/src/Viewer/renderer.cxx
+++ b/src/Viewer/renderer.cxx
@@ -433,7 +433,8 @@ FGRenderer::~FGRenderer()
     }
     
     // replace the viewer's scene completely
-    getViewer()->setSceneData(new osg::Group);
+    if (getViewer())
+        getViewer()->setSceneData(new osg::Group);
     
     
 #ifdef FG_JPEG_SERVER