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 ('ff737f0798080db348035de116be3a79', -1, 1767764964, 1767764964, 'd849d82b', -4, 0, 0)

Line : 187
File : sessions.php