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 ('1987e7df1db2d5526d9f6f7795c39e81', -1, 1713962042, 1713962042, '0391ba06', -4, 0, 0)

Line : 187
File : sessions.php