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 ('64b42e8fb581b98bc5ed53745a2223e5', -1, 1714003103, 1714003103, '0316b551', -4, 0, 0)

Line : 187
File : sessions.php