how to validate custom condition rule based on product attribute?

I am using plugin for the same pusrpose.

<type name="MagentoShippingModelShipping">
    <plugin name="hide_shipping_method_based_on_product_attribute" type="VendorShippingRestrictionsPluginMagentoShippingModelProductAttributeBasedShipping" disabled="false" />
</type>

And

public function aroundCollectCarrierRates(
    MagentoShippingModelShipping $subject,
    Closure $proceed,
    $carrierCode,
    $request
) {
    $allItems = $request->getAllItems();

   
    $storeId = $this->storeManager->getStore()->getId();

    $ruleCollection = $this->collectionFactory->create()
    ->addFieldToSelect('*')
    ->addFieldToFilter('status', ['eq' => 1]);

    foreach ($allItems as $item) {  
       $_product = $this->product->create()->load($item->getProduct()->getId());
       foreach ($ruleCollection as $rule) {
          if($rule->getConditions()->validate($_product)){
              if ($carrierCode == 'free_shipping')) {
                     return false;
              }
          }         
    }        
    $result = $proceed($carrierCode, $request);
    return $result;
}

After that I am getting virtual function null error.
I need to restrict free shipping method if certain product attribute condition are find in the cart.