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 ('e4a03813a0a3e9fe91e2d05e1e70ca01', -1, 1757044031, 1757044031, 'd849d80f', -9, 0, 0)

Line : 247
File : sessions.php