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 ('1f5fd9bb81b7f5d22eb4c34c8390f009', -1, 1708792909, 1708792909, '03ef4c19', -8, 0, 0)

Line : 187
File : sessions.php