Remove URL from breadcrumb

[dotnetrix]

I am trying to remove the knowledge base article title from the breadcrumb without success, my code currently looks like

 

{php}
$breadcrumb = $this->get_template_vars('breadcrumbnav');
$breadcrumb = str_replace(' {$kbarticle.title} ', '', $breadcrumb);
$this->assign('breadcrumbnav', $breadcrumb);
{/php}

 

Any ideas would be welcome.