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 ('d89f33335f47f3a9db552af5ed577616', -1, 1711668761, 1711668761, '36d27ee8', -8, 0, 0)

Line : 187
File : sessions.php