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 ('99c2292e0d0fd4a2b8429c451c446b92', -1, 1768592017, 1768592017, 'd849d854', 6, 0, 0)

Line : 187
File : sessions.php