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 ('855fdb63bc1706b967794382eadf3274', -1, 1762159159, 1762159159, 'd849d885', 9, 0, 0)

Line : 187
File : sessions.php