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 ('168856333e798faa90f07d29fd19da00', -1, 1770205463, 1770205463, 'd849d87f', 1, 0, 0)

Line : 187
File : sessions.php