phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '47fe025ec4e9437106e2c7ea521917c3' 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 ('47fe025ec4e9437106e2c7ea521917c3', -1, 1508568701, 1508568701, '36a7cab8', 26, 0, 0)

Line : 187
File : sessions.php