mm_forum

If I create or delete a page I get this error:

PHP Warning: unlink() [function.unlink]: open_basedir restriction in effect. File() is not within the allowed path(s): (/usr/X11R6/bin:/usr/bin:/usr/sbin:/xxxxx/xxxxx/www:/tmp:/home/counters:/var/lib/typo3) in /xxxxx/xxxxx/www/typo3conf/ext/mm_forum/includes/cache/class.tx_mmforum_cache_file.php line 141

The line tries to delete nothing if there is no files
141: foreach((array)$files as $file) unlink($file);

could be fixed with:
foreach((array)$files as $file){
if($file){unlink($file);}
}