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 ('a9d8fc00b56f0c24d4859a189b6dd550', -1, 1754380457, 1754380457, 'd849d833', 2, 0, 0)

Line : 189
File : sessions.php