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 ('3c2422eb4c0d9eb9e2ad1d6db2d1cbef', -1, 1711714787, 1711714787, '12e842bc', -4, 0, 0)

Line : 187
File : sessions.php