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 ('40ca42ce3e4a053940babb43e589cce8', -1, 1713955667, 1713955667, '03912ffd', -7, 0, 0)

Line : 187
File : sessions.php