phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6e932519f88b838049aa1f854e6fd4b7', -1, 1714000127, 1714000127, '12755b99', 6, 0, 0)

Line : 187
File : sessions.php