phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '51af579bd06e4f42a342fcc70d757b16' 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 ('51af579bd06e4f42a342fcc70d757b16', -1, 1768375153, 1768375153, 'd849d868', -4, 0, 0)

Line : 187
File : sessions.php