For those that can't currently upgrade to CVS PHP place the following in line 128 of rss_parse.inc
if (!preg_match('/\<item/im',$source) || !preg_match('/\<entry/im',$source))
throw new Exception('Not a valid feed');
and then catch the exception.
This basically checks for any RSS items or atom entries.
Yes its ugly, but it works until a proper PHP fix will exist on my host
Ignore that - it is only a poor partial solution and PHP still crashes. Something better is needed.