phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '879844dd3d3d8ffe4102b3087cf1da3f' 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 ('879844dd3d3d8ffe4102b3087cf1da3f', -1, 1532290806, 1532290806, '36c6f333', 3, 0, 0)

Line : 198
File : sessions.php