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 ('f2f370ac1bd7ca6c9771fd67ea688aee', -1, 1714029047, 1714029047, '12760907', -10, 0, 0)

Line : 187
File : sessions.php