phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '51a0353d8662c0db27b49470d2e85d72' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('51a0353d8662c0db27b49470d2e85d72', -1, 1770497874, 1770497874, 'd849d802', 2, 0)

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