mysqli - Fatal error: Call to a member function fetch_assoc() on a non-object php mysql prepared statement

I have the following prepared statement for select query

$product_info = $this->mysqliengine->prepare("select product_id, sku from product limit 10");
        $product_info->execute();
        $res = $product_info->bind_result();
        while($row = $res->fetch_assoc()) {
            echo $row['sku'].'
';
        }

But It is showing fatal error as

Fatal error: Call to a member function fetch_assoc() on a non-object

Answer

try to debug yourself

I hope this will solve

$product_info = $this->mysqliengine->prepare("select product_id, sku from product limit 10");

        $product_info->execute();
        $product_info->bind_result($product_id,$sku);

        while($product_info->fetch()) {
            echo $product_id.'
';
        }
        $product_info->close();