phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '85cfb72f93f2a6a416eb653c58a34908' 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 ('85cfb72f93f2a6a416eb653c58a34908', -1, 1513497661, 1513497661, '6b1473ae', 4, 0, 0)

Line : 187
File : sessions.php