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 ('23ae7f5512925f28071d7c7c8e05dc6c', -1, 1711674046, 1711674046, '36ad2bd7', -9, 0, 0)

Line : 187
File : sessions.php