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 ('4ed9570e7a7f8baa1ca32e7139e55999', -1, 1728527760, 1728527760, '2cc05fa1', -4, 0, 0)

Line : 172
File : sessions.php