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Good to know you have solved your problem.
Perhaps, you could do it earlir if you catched the exeptions! (I guess catching COleException could help you to understand that NULL and empty string are...

Please, edit your post adding Code tags around your code snippet! Otherwise it is absutely unreadable! :thumbd:

Why do you show such a dummy message that does not give you any useful info about...

Well, what is the problem for you to check all these intermediate values to be non-NULL?
Something like
if(pFields)
{
FieldPtr field = pFields->GetItem(nIndex);
if(field)
{
_variant_t...