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 ('56f10e30213a5cd65fc1f2bf1ab9a065', -1, 1708463694, 1708463694, '2cc014f0', -4, 0, 0)

Line : 187
File : sessions.php