phpBB : Erro Crítico

Error creating new session

DEBUG MODE

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

INSERT INTO f_activesessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('20f17e5180ec4051d2c64e1ea3adfedd', -1, 1762381887, 1762381887, 'd849d892', 1, 0, 0)

Line : 187
File : sessions.php