phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO elranchito_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('cf182ebeda2ac6a9e3f48a22065ca378', -1, 1474977804, 1474977804, '36c490f2', 0, 0, 0)

Line : 172
File : sessions.php