Added check before using pointer
Added check before using pointer

marchelbling/osg,tomasthoresen/osg,openscenegraph/osg,marchelbling/osg,scrawl/osg,jtorresfabra/osg,openscenegraph/osg,openscenegraph/osg,tomasthoresen/osg,jtorresfabra/osg,scrawl/osg,jtorresfabra/osg,tomasthoresen/osg,marchelbling/osg,scrawl/osg,openscenegraph/osg,marchelbling/osg,jtorresfabra/osg,scrawl/osg,tomasthoresen/osg