phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '3a12cef3bbbbd6e3a6cc7c363784aaf9' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('3a12cef3bbbbd6e3a6cc7c363784aaf9', -1, 1766088340, 1766088340, 'd849d8d7', -4, 0, 0)

Line : 187
File : sessions.php