vB did not load Language properly

[Hoffi]

The Problem was, that the function verify_id() sets an Field into $vbphrase which is not initialized this time. So fetch_userinfo() did not load the language Settings.

Does anybody have an idea why the function sets the array?

PHP Code:

    if (empty($vbphrase["$idname"]))
    {
        $vbphrase["$idname"] = $idname;
    } 


Whats the reason for this code?