phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6487807cd14b191c1338ce836ee5d3c5' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('6487807cd14b191c1338ce836ee5d3c5', -1, 1770563122, 1770563122, 'd849d802', -9, 0)

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