I redid it like this:
<?php
$sponsoren_img = new WA_MySQLi_RS("sponsoren_img",$miedema_i,0);
$sponsoren_img->setQuery("SELECT * FROM sponsoren_img WHERE id_alb = ?");
$sponsoren_img->bindParam("i", "".($sponsoren_alb->getColumnVal("id_alb")) ."", "-1"); //colname
$sponsoren_img->execute();
?>
And now I get no errors anymore