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 ('3ac8838dd8bf011fbf39a6a2b72695b0', -1, 1767872842, 1767872842, 'd849d802', -4, 0, 0)

Line : 187
File : sessions.php