phpBB : Critical Error

Error creating new sessions

DEBUG MODE

SQL Error : 1062 Duplicate entry 'dcb167161322ebfa3babb648c8f2bf5d' 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 ('dcb167161322ebfa3babb648c8f2bf5d', -1, 1513367454, 1513367454, '36a33d42', -2, 0, 0)

Line : 187
File : sessions.php