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 ('1a7d5fb8541aa43ad77cd3ee0b1f48a9', -1, 1714654521, 1714654521, '030c47ed', -4, 0, 0)

Line : 187
File : sessions.php