phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f40c5c12753f98dc73f3d2edf97c9a94' for key 1

INSERT INTO sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f40c5c12753f98dc73f3d2edf97c9a94', -1, 1472082947, 1472082947, '3650b208', 57, 0, 0)

Line : 187
File : sessions.php