phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'afcc30382ead1b090f7801f8760760e5' 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 ('afcc30382ead1b090f7801f8760760e5', -1, 1409579155, 1409579155, 'b84848b6', 15, 0, 0)

Line : 245
File : sessions.php