phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '512ffff3af48c9f17bf6c66a43066ca6' 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 ('512ffff3af48c9f17bf6c66a43066ca6', -1, 1767291949, 1767291949, 'd849d803', 18, 0, 0)

Line : 187
File : sessions.php