phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '420796a84ec438adc36718eeef6b2fa4' 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 ('420796a84ec438adc36718eeef6b2fa4', -1, 1777674810, 1777674810, 'd849d808', -4, 0, 0)

Line : 187
File : sessions.php