phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f2e986fed4da3255cdacc175ba51c8b8' for key 1

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f2e986fed4da3255cdacc175ba51c8b8', -1, 1498399095, 1498399095, '3650153d', 5, 0, 0)

Line : 187
File : sessions.php