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 ('784a4a0fdaecd5e9ebff845d4451b4a3', -1, 1728639822, 1728639822, '03ec56b8', -8, 0, 0)

Line : 187
File : sessions.php