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 ('ad41002f6c494695f0137513f6f0dd9f', -1, 1714039850, 1714039850, '03850cac', -4, 0, 0)

Line : 187
File : sessions.php