From Wang Rui, merged from changeset 12674. "I've found a small problem which causes crashes in the 3ds plugin

while trying to load a model. The fix here will ensure that the
texture map is valid and everything could work well then."

src/osgPlugins/3ds/ReaderWriter3DS.cpp

@@ -1141,7 +1141,7 @@ ReaderWriter3DS::StateSetInfo ReaderWriter3DS::ReaderObject::createStateSet(Lib3
 
     // opacity
     osg::Texture* opacity_map = createTexture(&(mat->opacity_map),"opacity_map", textureTransparency);
-    if (opacity_map)
+    if (opacity_map && texture1_map)
     {
         if(texture1_map->getImage()->isImageTranslucent())
         {