phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b5d43865dc3f284b7c1d88e515fc6e71' 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 ('b5d43865dc3f284b7c1d88e515fc6e71', -1, 1495762615, 1495762615, '36a25b56', 0, 0, 0)

Line : 187
File : sessions.php