How to fix Fatal error: Call to a member function find() on a non-object Error?

I run a MP3 search engine site and I use beemp3 recent search list on my site footer.
It works for few hours and after sometime I get this error.

Fatal error: Call to a member function find() on a non-object in /home/xxxxx/public_html/xxxx/xxxx/includes/functions.php on line 177

I have this on on line 177

function beemp3200($limit) {
	                $html = @file_get_html('http://beemp3.com/');
	                $last200area = $html->find('div[class="last200"]', 0);
line177-->   	$last200 = $last200area->find('a');

	if (!isset($limit)) {
		$limit = $settings['recentlimit'];
	}

	$count = 0;
	foreach ($last200 as $onesearch) {
		$onesearch = expstr($onesearch, '>', '<');
		$onesearch2 = seoit($onesearch);
		echo '<a href="'.WEB_PATH.'search/mp3/1/'.$onesearch2.'.html" title="'.preg_replace("/[^a-zA-Z0-9\s]/", "", $onesearch).' free mp3 download">'.$onesearch.'</a>';
		$count++;
		if ($count >= $limit) { break; }  else { echo ' - ';}
	}
}

Code (markup):

what could be the wrong?
please help..

 

you can look print_r($html); . if $html have find , there is no error.but ı think $have havent got find