notice message with this code

Notice: Undefined property: stdClass::$qty in eval() (line 2 of /home/content/27/8309527/html/sites/all/modules/uc_custom_price/uc_custom_price.module(87) : eval()'d code).

<input id="edit-qty" class="form-text required" type="text" maxlength="6" size="5" value="1" name="qty">

$item->price = $item->price;
if ($item->qty > 5) {
  $item->price = $item->price + 20;
}