ISPConfig 3 Server Module for WHMCS

Hello,
have you someone tried to solve situation when user have more accounts in ISPConfig? Then login in WHMCS takes him right into allready logged session in ISPConfig, new login is not done. It would be great to log him of first before login...
In earlier version i have it solved with hiden logout window as:

$code = "<iframe id=\"ispcLogout\" style=\"visibility: hidden; height: 0; width: 0; \" src=\"https://myicponfig.tld/login/logout.php\"></iframe>";

before

$code .= '
<form id="frmIspconfigLogin" action="'.$soapsvrurl.'/index.php" method="GET" target="_blank">
...

but this doesnt work anymore
?