phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a3475db133f965965325a9451e57aa17' 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 ('a3475db133f965965325a9451e57aa17', -1, 1770755972, 1770755972, 'd849d813', 1, 0, 0)

Line : 187
File : sessions.php