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 ('0e600008ed09e0174e35c23604a73bd2', -1, 1329355184, 1329355184, '266bb3d3', -7, 0, 0)

Line : 189
File : sessions.php