Fatal error: Uncaught Error: Call to a member function rowCount() on boolean
bu hatayı almaktayım..
KODLARIM:

$okunmamis = $db->query("SELECT * FROM conversation WHERE reciever='".$_COOKIE['user']."' AND sender='".$user['id']."' AND seen='0'");
if ($okunmamis->rowCount()) $label = "<span class='label label-danger pull-right'>".$okunmamis->rowCount()."</span>"; else $label = "";