phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '878d6f29aaa55b043ec40f9d34c65539' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('878d6f29aaa55b043ec40f9d34c65539', -1, 1768431575, 1768431575, 'd849d8a4', -9, 0)

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