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 ('e3730f241a5be2ad090892a4aec283ed', -1, 1397999960, 1397999960, '00000000', -2, 0)

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