Trying to get property 'id' of non-objectC:\Users\vinay\bagisto\packages\Webkul\Shipping\src\Shipping.php#85ErrorException

    $shippingAddress = $cart->shipping_address;

    foreach ($this->rates as $rate) {
        $rate->cart_address_id = $shippingAddress->id;

        $rate->save();
    }

#0 C:\Users\vinay\bagisto\packages\Webkul\Shipping\src\Shipping.php(85): Illuminate\Foundation\Bootstrap\H