phpBB : Critical Error

Error creating new sessions

DEBUG MODE

SQL Error : 1062 Duplicate entry '9cfa762f0f665253b94051f4917d8b41' 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 ('9cfa762f0f665253b94051f4917d8b41', -1, 1513421330, 1513421330, '17168838', 2, 0, 0)

Line : 187
File : sessions.php