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 ('ac5f3ec6b16319340203825980f12ac4', -1, 1713509008, 1713509008, '12dd5521', -4, 0, 0)

Line : 187
File : sessions.php