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 ('647e4f6b5e8ccbc44233b564a85ac4e0', -1, 1713895964, 1713895964, '12da7f8d', 2, 0, 0)

Line : 187
File : sessions.php