phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('79d269d9b823599d8853ca01f8d88d91', -1, 1290568348, 1290568348, 'ccecebf5', 0, 0)

Line : 152
File : /var/www/html/forums/includes/sessions.php