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 ('651041fd991538b6bbb37844f1f17dc4', -1, 1752808648, 1752808648, '126109ab', -2, 0, 0)

Line : 189
File : sessions.php