[php] Trying to get property of non-object

سلام عليكم

أحاول تحديث قاعدة البيانات ببيانات مصفوفة كالتالي

$sizes = array(json_decode($_POST["sizeValues"]));
       // $id = $_POST["id"];

    print_r($sizes);

        foreach ($sizes as  $size) {
            $name = intval($size->item_name);
            $id = intval($size->item_id);

            $sql = "UPDATE patron_sizes SET size_count='$name',  WHERE id=$id";
            $result = $conn->query($sql);
            if ($result) {
                echo 'done';
            }

        }

أواجه الخطأ التالي

Notice:  Trying to get property 'item_name' of non-object in <b>C:\xampp\htdocs\atms\requests\edit_patron.php</b> on line 35

Notice:  Trying to get property 'item_id' of non-object in <b>C:\xampp\htdocs\atms\requests\edit_patron.php</b> on line 36

المصفوفة تطبع بالشكل التالي

Array
(
    [0] => Array
        (
            [0] => stdClass Object
                (
                    [item_id] => 2758
                    [item_name] => 5000
                )

            [1] => stdClass Object
                (
                    [item_id] => 2759
                    [item_name] => 4000
                )

            [2] => stdClass Object
                (
                    [item_id] => 2760
                    [item_name] => 6000
                )

            [3] => stdClass Object
                (
                    [item_id] => 2761
                    [item_name] => 0
                )

            [4] => stdClass Object
                (
                    [item_id] => 2762
                    [item_name] => 2
                )

            [5] => stdClass Object
                (
                    [item_id] => 2763
                    [item_name] => 2000
                )

            [6] => stdClass Object
                (
                    [item_id] => 2764
                    [item_name] => 2000
                )

            [7] => stdClass Object
                (
                    [item_id] => 2765
                    [item_name] => 2000
                )

            [8] => stdClass Object
                (
                    [item_id] => 2766
                    [item_name] => 2000
                )

            [9] => stdClass Object
                (
                    [item_id] => 2767
                    [item_name] => 2000
                )

            [10] => stdClass Object
                (
                    [item_id] => 2768
                    [item_name] => 10000
                )

            [11] => stdClass Object
                (
                    [item_id] => 2769
                    [item_name] => 5000
                )

            [12] => stdClass Object
                (
                    [item_id] => 2770
                    [item_name] => 2500
                )

            [13] => stdClass Object
                (
                    [item_id] => 2771
                    [item_name] => 2500
                )

            [14] => stdClass Object
                (
                    [item_id] => 2772
                    [item_name] => 5000
                )

        )

)

ما الحل فضلا ؟