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 ('8bfbd96fe156c96743a1e691843c440d', -1, 1768514652, 1768514652, 'd849d8de', 1, 0, 0)

Line : 187
File : sessions.php