IF条件未处理

请，任何人可以帮助我理解为什么不工作?我回显变量来检查值，我有各自的0和1，相同的IF条件…查询工作，如果不工作…

$data = ($_POST);
$cn = $data['cn'];
$email = $data['email'];
$con1 = mysql_query("SELECT * FROM `crm` WHERE cn = '$cn'", $con);
$num_cn = mysql_num_rows($con1);
$con2 = mysql_query("SELECT * FROM `crm_contacts` WHERE email = '$email'", $con);
$num_email = mysql_num_rows($con2);
        echo $num_cn;
        echo "<br>";
        echo $num_email;
 if ($num_cn == "0" && $num_email == "1") {
    echo "<script type='text/javascript'>"; 
echo "location.href='crm.php?Error=2;"; 
echo "</script>";
 exit;
 }