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 ('596b0c33624e5b2c99ae523d123789ce', -1, 1397918571, 1397918571, '00000000', -1, 0)

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