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 ('2608db877f9959a213309c149da4f7c8', -1, 1768485485, 1768485485, 'd849d89c', 6, 0, 0)

Line : 187
File : sessions.php