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 ('20746fe03edd435d591e2966fadd07fd', -1, 1768654103, 1768654103, 'd849d854', 9, 0, 0)

Line : 187
File : sessions.php