phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO bbs1_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('c8ae43f3e9906bd4e5ab0a1a13f016ca', -1, 1406159654, 1406159654, '00000000', 154, 0)

Line : 152
File : /home/purplebunny/html/bbs/includes/sessions.php