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 ('687d5361c5aa3cdf173fa3dc8218cf66', -1, 1711664178, 1711664178, '2cc81785', -4, 0, 0)

Line : 187
File : sessions.php