Thread:Extension talk:Secure HTML/PHP Error in SecureHTML.php

Notice: Undefined index: keyname in C:\xampp\htdocs\mediawiki\extensions\SecureHTML.php on line 59

This shows up after I have embedded some HTML (a Facebook Like Box) using an iframe. I am currently running WM-1.16 on a xampp server for development purposes, and I understand about turning off the error messages in PHP. Any suggestions about how to permanently remove it?