fixed issue #24410

Author: ashutosh

app/code/Magento/Catalog/Model/Product/TierPriceManagement.php

@@ -182,16 +182,19 @@ public function getList($sku, $customerGroupId)
             : $customerGroupId);
 
         $prices = [];
-        foreach ($product->getData('tier_price') as $price) {
-            if ((is_numeric($customerGroupId) && (int) $price['cust_group'] === (int) $customerGroupId)
-                || ($customerGroupId === 'all' && $price['all_groups'])
-            ) {
-                /** @var \Magento\Catalog\Api\Data\ProductTierPriceInterface $tierPrice */
-                $tierPrice = $this->priceFactory->create();
-                $tierPrice->setValue($price[$priceKey])
-                    ->setQty($price['price_qty'])
-                    ->setCustomerGroupId($cgi);
-                $prices[] = $tierPrice;
+        $tierPrices = $product->getData('tier_price');
+        if ($tierPrices !== null) {
+            foreach ($tierPrices as $price) {
+                if ((is_numeric($customerGroupId) && (int) $price['cust_group'] === (int) $customerGroupId)
+                    || ($customerGroupId === 'all' && $price['all_groups'])
+                ) {
+                    /** @var \Magento\Catalog\Api\Data\ProductTierPriceInterface $tierPrice */
+                    $tierPrice = $this->priceFactory->create();
+                    $tierPrice->setValue($price[$priceKey])
+                        ->setQty($price['price_qty'])
+                        ->setCustomerGroupId($cgi);
+                    $prices[] = $tierPrice;
+                }
             }
         }
         return $prices;