ActiveRecord Session Handling - rails 2.0.2

I've started using rails version 2.0.2.I'm using active-record-store in
order to store the session information.There is a problem with the
storage of sesion data.It goes in as null.However with earlier version
of rails, I was able to log the session data without any issues into the
sessions table created using rake:db:sessions:create.

Please advice if any additional configuratio is required.