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 ('7cd7d922270a483c5150c16015d56b81', -1, 1714033971, 1714033971, '0392ff7f', -2, 0, 0)

Line : 187
File : sessions.php