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 ('ce4a1b1690ec549270dd4fa6bfd0d5f8', -1, 1544462945, 1544462945, '23afb66a', 0, 0, 0)

Line : 189
File : sessions.php