phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '79c9c06d1fc47f7afc01633dfa7923c0' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('79c9c06d1fc47f7afc01633dfa7923c0', -1, 1781102923, 1781102923, 'd849d8cc', -4, 0, 0)

Line : 187
File : sessions.php