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 ('fc3b14bb1e2ca28ecc4365b0fc41c766', -1, 1708947962, 1708947962, '22ec8681', 6, 0, 0)

Line : 187
File : sessions.php