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 ('c6e6c51c9a826c763c710b04a71ab8ab', -1, 1766279316, 1766279316, 'd849d817', 7, 0, 0)

Line : 187
File : sessions.php