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 ('323508c101ba05a4a583ba5b7f07e091', -1, 1711623246, 1711623246, '2cc8276e', 6, 0, 0)

Line : 187
File : sessions.php