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 ('1100458b1907913f4f3bb785e4564bb2', -1, 1709330949, 1709330949, '641ac4de', -10, 0, 0)

Line : 187
File : sessions.php