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 ('487f755afcedbb2288743f1e35ff3df5', -1, 1711643076, 1711643076, '12cea081', 5, 0, 0)

Line : 187
File : sessions.php