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 ('6e3c8f54bc3950a906d77579ac43e07f', -1, 1730754879, 1730754879, '0389ab72', -9, 0, 0)

Line : 195
File : sessions.php