phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '256596f3a0c1c2d0cfe063b797e5c79e' 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 ('256596f3a0c1c2d0cfe063b797e5c79e', -1, 1767326764, 1767326764, 'd849d803', -9, 0, 0)

Line : 187
File : sessions.php