产品货币无法正常工作，我在Modx系统中收到错误[关闭]

I have use Modx CMS. today i get this error. Bellow my error line.

Fatal error: Call to a member function get() on null in /var/www/bottega/core/cache/includes/elements/modsnippet/63.include.cache.php on line 24

$id = $row['id'];
$product = $modx->getObject('modResource',  $id)->Product;
$price = $product->sm_price;
$currency = (int)$product->sm_currency; //$currency out is 153 dynamically
$currency =  $modx->getObject('modResource', trim($currency))->get('longtitle'); //this line number 24

Actually, when i initialize manually $currency variable 153 then this problem solve. but when i use $currency initialize from database (int)$product->sm_currency; it show error

Fatal error: Call to a member function get() on null in /var/www/bottega/core/cache/includes/elements/modsnippet/63.include.cache.php on line 24

For example $currency variable manually initialize with 153

$id = $row['id'];
$product = $modx->getObject('modResource',  $id)->Product;
$price = $product->sm_price;
$currency = 153; 
$currency =  $modx->getObject('modResource', trim($currency))->get('longtitle'); //this line number 24

Now work fine

This could be caused by a change of the PHP version by your hosting company.

Since you added some code in your question: Please check whether an object exist, before you use it (sample below).

$id = $row['id'];
$productRes = $modx->getObject('modResource',  $id);
if ($productRes && $productRes->Product) {
    $product = $productRes->Product;
    $price = $product->sm_price;
    $currency = (int)$product->sm_currency;
    $currencyRes = $modx->getObject('modResource', $currency);
    if ($currencyRes) {
        $currency = currencyRes->get('longtitle');
    }
}