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 ('5662f6472cf0b9a3be0dcd23724c3d6f', -1, 1711619126, 1711619126, '2cc983d5', -4, 0, 0)

Line : 187
File : sessions.php