"Null or not a object" error

[danyz81]

Hello!

I'm using a script code for show the last threads on an external html page.
Work well, the problem is that the IE Console show me a error messages with:
line: 3360 'threads[...].threadid' is null or not a object


This is a part of the code script on the footer of my style:

<div class="lthds"><!-- BEGIN LATEST THREAD CODE -->

<script type="text/javascript" src="external.php?forumids=2,286,13,14,302,282,284,17,16,280,281,277,278,283,270,299,271,274,275,276&type=js"></script>


<script language="" type="text/javascript">
<!--
for (x = 0; x < 10; x++)
{
document.writeln("<p><a href=\"showthread.php?t="+threads[x].threadid+"\">"+threads[x].title+"</a>  (by: "+threads[x].poster+")</p>");
}
//-->
</script>
<br />
<!-- END LATEST THREAD CODE --></div>

Any help?

Thanks in advance,
Daniele.