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 ('278d802193c65bc398a65d3a88bdb05d', -1, 1714040594, 1714040594, '2cc81bd7', -1, 0, 0)

Line : 187
File : sessions.php