phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '9987c6bd498c193758a7d5d9d16e3966' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('9987c6bd498c193758a7d5d9d16e3966', -1, 1766727216, 1766727216, 'd849d893', 7, 0)

Line : 180
File : /www/includes/sessions.php