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 ('a2ddef91125ea6fe54e6ff7817b8928a', -1, 1713558721, 1713558721, '0391088d', -4, 0, 0)

Line : 187
File : sessions.php