Soapcall without parameters results in a blank screen

When do a soapcall on a function that does not require parameters my screen turns blank. While when I run a soapc开发者_如何学运维all that does require parameters I receive data/errors.

try {
    $r = $this->c->__soapCall($func, $params);
} catch( Exception $e ) {
    return $e->getMessage();
}

$this->c = of course the soapclient who connets correctly.

Also I get no errors in my log or returned to my screen. There are no syntax errors.

Problem was that $parameters were null, which is not allowed.