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 ('5b4657e33b130e086c64e3c0d1d9b5b2', -1, 1770134278, 1770134278, 'd849d87f', 5, 0, 0)

Line : 187
File : sessions.php