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 ('89bc8e27f8fce7d5e01a1b3120e94079', -1, 1714610786, 1714610786, '0390098d', -4, 0, 0)

Line : 187
File : sessions.php