diff --git a/src/osgDB/ObjectCache.cpp b/src/osgDB/ObjectCache.cpp
index 6f491890c..49518918f 100644
--- a/src/osgDB/ObjectCache.cpp
+++ b/src/osgDB/ObjectCache.cpp
@@ -68,6 +68,8 @@ void ObjectCache::addObjectCache(ObjectCache* objectCache)
 
 void ObjectCache::addEntryToObjectCache(const std::string& filename, osg::Object* object, double timestamp, const Options *options)
 {
+    if (!object) return;
+
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
     _objectCache[FileNameOptionsPair(filename, options ? osg::clone(options) : 0)] = ObjectTimeStampPair(object,timestamp);
     OSG_DEBUG<<"Adding "<<filename<<" with options '"<<(options ? options->getOptionString() : "")<<"' to ObjectCache "<<this<<std::endl;