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 ('e72da303fdb8537d4bcb4e1f82e9f7af', -1, 1711615422, 1711615422, '36ad2bd7', -2, 0, 0)

Line : 187
File : sessions.php