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 ('896da42040d22e53d896d5ce45ef3ace', -1, 1711672990, 1711672990, '2cc865aa', 0, 0, 0)

Line : 187
File : sessions.php