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 ('388243a365cae685c4d0782c7fc951b3', -1, 1714002120, 1714002120, '12777d87', -4, 0, 0)

Line : 187
File : sessions.php