validation COM pointers in release builds   

I am using a piece of code like this:

CDOCSObject * pObject = NULL;
map<CString, CDOCSObjectCacheItem *>::iterator cacheItr = 
m_DOCSObjectCache.find(strID);
if ( cacheItr != m_DOCSObjectCache.end() )
{
	pObject = (*cacheItr).second->m_pObject;
	pObject->AddRef();		
}
return pObject;

pObject->AddRef() is throwing an access violation error in release builds.

I tried to validate pObject using 
if(pObject != NULL) and IsBadReadPtr() etc but doesnt help.
It still throws same error in release build. Is there a way to check for 
validity of COM pointer in release build.

Thanks in advance
Chandan

date: Wed, 13 Aug 2008 00:25:01 -0700   author:   balaji chandan