[jQuery] length required response when using .post

[cfdvlpr]

Has anyone else noticed this response? What's going on here?
Below is the code that I use to report javascript errors to me.  And,
occasionally, I'll notice this response in Firebug for the post to
the /javascript/emailError.cfm page.

<script type="text/javascript">
                        onerror = function(msg,url,l)
                        {
                           var error="";
                                error+="Error: " + msg + "\n";
                                error+="URL: " + url + "\n";
                                error+="Line: " + l + "\n\n";
                                $.post("/javascript/emailError.cfm",{error : 
error} );
                                return true;
                        }

                $(function(){
...
...