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 ('1892b5a0afd1319abab9b0623c778c58', -1, 1768703910, 1768703910, 'd849d854', -4, 0, 0)

Line : 187
File : sessions.php