Merge tag 'hotfix_659' into dev

hotfix_659

backend/controllers/DistributionController.php

@@ -482,15 +482,17 @@ class DistributionController extends BackendController
 
             $quantity = 0;
             $invoicePrice = null;
-            foreach ($order->productOrder as $productOrder) {
-                if ($productOrder->id_product == $product['id']) {
-                    if ($productOrder->invoice_price) {
-                        $invoicePrice = number_format($productOrder->invoice_price, 2);
-                    } else {
-                        $invoicePrice = number_format($productOrder->price, 3);
-                    }
 
-                    $quantity = $productOrder->quantity;
+            if(isset($order->productOrder)) {
+                foreach ($order->productOrder as $productOrder) {
+                    if ($productOrder->id_product == $product['id']) {
+                        if ($productOrder->invoice_price) {
+                            $invoicePrice = number_format($productOrder->invoice_price, 2);
+                        } else {
+                            $invoicePrice = number_format($productOrder->price, 3);
+                        }
+                        $quantity = $productOrder->quantity;
+                    }
                 }
             }