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 ('594fea564a9140bd95b4d112088da5b9', -1, 1711708935, 1711708935, '03dba7a3', -4, 0, 0)

Line : 187
File : sessions.php