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 ('6c4db8c16e681d87510d941161ded1ba', -1, 1711717212, 1711717212, '22e42b5a', 5, 0, 0)

Line : 187
File : sessions.php