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 ('a09ef5b7c7d79f8d337d939028024dfb', -1, 1713893858, 1713893858, '12bfd8a3', -4, 0, 0)

Line : 187
File : sessions.php