phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO forum_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('68402332e2a9c5566143c4881d091770', -1, 1527375937, 1527375937, '36505209', -10, 0, 0)

Line : 187
File : sessions.php