phpBB : Critical Error

Error creating new sessions

DEBUG MODE

SQL Error : 1062 Duplicate entry '27cecfb554e49550ddc45f5045a8fdc6' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('27cecfb554e49550ddc45f5045a8fdc6', -1, 1511225002, 1511225002, '36a16c9e', 4, 0, 0)

Line : 187
File : sessions.php