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 ('2c317e5ea1e0e81bc61a96abe011108e', -1, 1714001974, 1714001974, '0392ddcc', 3, 0, 0)

Line : 187
File : sessions.php