Session Handler: Database - does not work.

I attempted to change the Session Handler from File to Database and the program "flaked out". All settings were lost and I couldn't make changes. I had to manually alter the setting back to file.

same here.. there is a problem about this.

I've connected to mysql and changed the value back to file.

update xxx_settings set value='file' where key='general.session_handler';

and it is working now.