phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '51cb11455b08634026284b9f5948d38f' 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 ('51cb11455b08634026284b9f5948d38f', -1, 1771187035, 1771187035, 'd849d800', -4, 0, 0)

Line : 187
File : sessions.php