phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO start_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('ba3c88c0ce3ec3c6c7340e57e908145c', -1, 1410931809, 1410931809, '36a7607c', 0, 0)

Line : 158
File : sessions.php