problem with breadcrumb

[chack1172]

Hi guys,
I have a problem with a code of my plugin:

$currdir = $mybb->input['directory'];
$list_dir = explode("/", $currdir);
foreach($list_dir as $d){
    $page->add_breadcrumb_item($d, "index.php?module=file-list&directory=$d");
}

When I go to myforum/admin/index.php?module=file-list&directory=admin/modules/user it works, it show me admin >> modules >> user but the link is wrong.
If I click modules it redirect me to ?module=file-list&directory=modules and not admin/modules, how to fix it?