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, session_admin) VALUES ('d5f4ac747420b9f4210d6a0e5ee40a43', -1, 1246591454, 1246591454, '26673f3e', 0, 0, 0)

Line : 187
File : sessions.php