phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('8c51e20603e76508ef65e67a01c497cc', -1, 1579230849, 1579230849, '641ab3c4', -9, 0, 0)

Line : 172
File : sessions.php