Update function getCustomerOrders to avoid error

classes/order/Order.php

@@ -978,9 +978,9 @@ class OrderCore extends ObjectModel
         foreach ($res as $key => $val) {
             // In case order creation crashed midway some data might be absent
             $orderState = !empty($val['id_order_state']) ? $indexedOrderStates[$val['id_order_state']] : null;
-            $res[$key]['order_state'] = $orderState['name'] ?: null;
-            $res[$key]['invoice'] = $orderState['invoice'] ?: null;
-            $res[$key]['order_state_color'] = $orderState['color'] ?: null;
+            $res[$key]['order_state'] = $orderState['name'] ?? null;
+            $res[$key]['invoice'] = $orderState['invoice'] ?? null;
+            $res[$key]['order_state_color'] = $orderState['color'] ?? null;
         }
 
         return $res;