[2.5.7] 404 - Category not found (only for Google's spider) - Joomla! Forum - community, help and support

hi,
i have joomla 2.5.7 site.
when spider search category page, error: "404 . category not found".
when user searches same page through browser receives correct answer.
if, on file index.php of joomla's root, force header, positive response:

code: select all

if($_server['request_method'] == 'head'){
   $_server['request_method'] = $_env['request_method'] = 'get';
}


why that?
the line generates 404 in com_content / views / category / view.html.php, function display(),

code: select all

if ($parent == false) {
return jerror::raiseerror(404, jtext::_('jglobal_category_not_found'));
}


1. advised update site last release = >2.5.8
2. site multilanguage site?
3. mean by
"when user searches same page through browser receives correct answer."