PHP Fatal error: Call to a member function advanced_render() on a non-object in...theme.inc...205

With several Themes (f.e. Theme Forestfloor) I get PHP Fatal error: Call to a member function advanced_render() on a non-object in...theme.inc...205.

I changed the function to theme_views_view_field():

function theme_views_view_field($view, $field, $row) {
// Reference safe for PHP 4:
if (is_object($view->field[$field->options['id']])) {
return $view->field[$field->options['id']]->advanced_render($row);
}
elseif (is_object($view->field[$field->field_alias])) {
return $view->field[$field->field_alias]->advanced_render($row);
}
else {
return null;
}
}