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 ('9a7b8493545bac02fd5689b3856a2cb3', -1, 1714033464, 1714033464, '340ee0c5', -7, 0, 0)

Line : 187
File : sessions.php