OfxTwitter and null

I would like to say that the OfxTwitter API works super well, I found out that when I std::cout the JSON file all the data is there.

But I get:
**[ error ] BaseSearchClient::_run: std::exception: : Exception: [json.exception.type_error.302] type must be string but is null**

This is due to some of the values in the JSON file being null. Is there a way to avoid the error? or change null to empty string?

Thank you for your time!