phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '51ca57ef06802201a52e51bdc37ef619' 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 ('51ca57ef06802201a52e51bdc37ef619', -1, 1766048147, 1766048147, 'd849d8d7', -4, 0, 0)

Line : 187
File : sessions.php