phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('7b74d0d03a55207ae1c286efd275533d', -1, 1493011093, 1493011093, '36c405f1', -9, 0, 0)

Line : 189
File : sessions.php