phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f086b3056265d22efe0285b098327b78' 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 ('f086b3056265d22efe0285b098327b78', -1, 1490596695, 1490596695, '369e6d59', 19, 0, 0)

Line : 187
File : sessions.php