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 ('4603153bfb641d22d825163ea68a7fb9', -1, 1711723887, 1711723887, '2cc8ed70', -4, 0, 0)

Line : 187
File : sessions.php