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 ('57153ef16d971e5e98094142ca9c0abd', -1, 1490399540, 1490399540, '32106160', 4, 0, 0)

Line : 187
File : sessions.php