[fw-db] Mysqli adapter inserts empty strings

Hi all,
I'm using Mysqli extension. When i try to insert a data to the
database it always inserts empty strings. I've searched for solution
but couldn't find anything. In PHP documentation it says:
The mysqli extension is designed to work with the version 4.1.3 or
above of MySQL. For previous versions, please see the MySQL extension
documentation.
And my server has MySQL v4.1.22. Do you think this is because of my
MySQL version?
Thanks.