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 ('889a8f1bb6a520b9bbf7fe60fd7bfee7', -1, 1714008495, 1714008495, '0395fa01', 6, 0, 0)

Line : 187
File : sessions.php