diff --git a/Model/Resolver/CreditMemo/PrintCreditMemo.php b/Model/Resolver/CreditMemo/PrintCreditMemo.php
index e2f84bc..de11ab4 100644
--- a/Model/Resolver/CreditMemo/PrintCreditMemo.php
+++ b/Model/Resolver/CreditMemo/PrintCreditMemo.php
@@ -2,6 +2,7 @@
 
 namespace ScandiPWA\SalesGraphQl\Model\Resolver\CreditMemo;
 
+use Magento\Framework\Exception\NoSuchEntityException;
 use Magento\Framework\GraphQl\Config\Element\Field;
 use Magento\Framework\GraphQl\Exception\GraphQlInputException;
 use Magento\Framework\GraphQl\Query\ResolverInterface;
@@ -18,18 +19,23 @@ class PrintCreditMemo implements ResolverInterface
     /**
      * @var CreditmemoRepositoryInterface
      */
-    protected $creditmemoRepository;
+    protected CreditmemoRepositoryInterface $creditmemoRepository;
 
     /**
      * @var OrderFormatter
      */
-    protected $orderFormatter;
+    protected OrderFormatter $orderFormatter;
 
     /**
      * @var OrderViewAuthorizationInterface
      */
-    protected $orderViewAuthorizationInterface;
+    protected OrderViewAuthorizationInterface $orderViewAuthorizationInterface;
 
+    /**
+     * @param CreditmemoRepositoryInterface $creditmemoRepository
+     * @param OrderFormatter $orderFormatter
+     * @param OrderViewAuthorizationInterface $orderViewAuthorizationInterface
+     */
     public function __construct(
         CreditmemoRepositoryInterface $creditmemoRepository,
         OrderFormatter $orderFormatter,
@@ -51,8 +57,13 @@ public function resolve(
         array $args = null
     ) {
         $customerId = $context->getUserId();
-        $refund = $this->creditmemoRepository->get($args['refundId']);
-        $order = $refund->getOrder();
+
+        try {
+            $refund = $this->creditmemoRepository->get($args['refundId']);
+            $order = $refund->getOrder();
+        } catch (NoSuchEntityException $e) {
+            throw new GraphQlInputException(__($e->getMessage()));
+        }
 
         if (!$this->orderViewAuthorizationInterface->canView($order, $customerId)) {
             throw new GraphQlInputException(__('Current user is not allowed to print this order'));
diff --git a/Model/Resolver/Invoice/PrintInvoice.php b/Model/Resolver/Invoice/PrintInvoice.php
index 1d58de8..2da45bb 100644
--- a/Model/Resolver/Invoice/PrintInvoice.php
+++ b/Model/Resolver/Invoice/PrintInvoice.php
@@ -2,7 +2,7 @@
 
 namespace ScandiPWA\SalesGraphQl\Model\Resolver\Invoice;
 
-use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\Exception\NoSuchEntityException;
 use Magento\Framework\GraphQl\Config\Element\Field;
 use Magento\Framework\GraphQl\Exception\GraphQlInputException;
 use Magento\Framework\GraphQl\Query\ResolverInterface;
@@ -19,18 +19,23 @@ class PrintInvoice implements ResolverInterface
     /**
      * @var InvoiceRepositoryInterface
      */
-    protected $invoiceRepository;
+    protected InvoiceRepositoryInterface $invoiceRepository;
 
     /**
      * @var OrderFormatter
      */
-    protected $orderFormatter;
+    protected OrderFormatter $orderFormatter;
 
     /**
      * @var OrderViewAuthorizationInterface
      */
-    protected $orderViewAuthorizationInterface;
+    protected OrderViewAuthorizationInterface $orderViewAuthorizationInterface;
 
+    /**
+     * @param InvoiceRepositoryInterface $invoiceRepository
+     * @param OrderFormatter $orderFormatter
+     * @param OrderViewAuthorizationInterface $orderViewAuthorizationInterface
+     */
     public function __construct(
         InvoiceRepositoryInterface $invoiceRepository,
         OrderFormatter $orderFormatter,
@@ -52,8 +57,13 @@ public function resolve(
         array $args = null
     ) {
         $customerId = $context->getUserId();
-        $invoice = $this->invoiceRepository->get($args['invoiceId']);
-        $order = $invoice->getOrder();
+
+        try {
+            $invoice = $this->invoiceRepository->get($args['invoiceId']);
+            $order = $invoice->getOrder();
+        } catch (NoSuchEntityException $e) {
+            throw new GraphQlInputException(__($e->getMessage()));
+        }
 
         if (!$this->orderViewAuthorizationInterface->canView($order, $customerId)) {
             throw new GraphQlInputException(__('Current user is not allowed to print this order'));
diff --git a/Model/Resolver/Invoices.php b/Model/Resolver/Invoices.php
index 364db38..a66d8f9 100644
--- a/Model/Resolver/Invoices.php
+++ b/Model/Resolver/Invoices.php
@@ -9,7 +9,6 @@
 
 use Magento\Framework\Exception\LocalizedException;
 use Magento\Framework\GraphQl\Config\Element\Field;
-use Magento\Framework\GraphQl\Query\ResolverInterface;
 use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
 use Magento\Sales\Api\Data\OrderInterface;
 use Magento\Sales\Api\Data\InvoiceInterface;
@@ -41,7 +40,7 @@ public function resolve(
         /** @var InvoiceInterface $invoice */
         foreach ($orderModel->getInvoiceCollection() as $invoice) {
             $invoices[] = [
-                'id' => base64_encode($invoice->getEntityId()),
+                'id' => base64_encode((string) $invoice->getEntityId()),
                 'number' => $invoice['increment_id'],
                 'comments' => $this->getInvoiceComments($invoice),
                 'model' => $invoice,
diff --git a/Model/Resolver/Shipment/PrintShipment.php b/Model/Resolver/Shipment/PrintShipment.php
index bcf66c3..0fed421 100644
--- a/Model/Resolver/Shipment/PrintShipment.php
+++ b/Model/Resolver/Shipment/PrintShipment.php
@@ -2,6 +2,7 @@
 
 namespace ScandiPWA\SalesGraphQl\Model\Resolver\Shipment;
 
+use Magento\Framework\Exception\NoSuchEntityException;
 use Magento\Framework\GraphQl\Config\Element\Field;
 use Magento\Framework\GraphQl\Exception\GraphQlInputException;
 use Magento\Framework\GraphQl\Query\ResolverInterface;
@@ -18,18 +19,23 @@ class PrintShipment implements ResolverInterface
     /**
      * @var ShipmentRepositoryInterface
      */
-    protected $shipmentRepository;
+    protected ShipmentRepositoryInterface $shipmentRepository;
 
     /**
      * @var OrderFormatter
      */
-    protected $orderFormatter;
+    protected OrderFormatter $orderFormatter;
 
     /**
      * @var OrderViewAuthorizationInterface
      */
-    protected $orderViewAuthorizationInterface;
+    protected OrderViewAuthorizationInterface $orderViewAuthorizationInterface;
 
+    /**
+     * @param ShipmentRepositoryInterface $shipmentRepository
+     * @param OrderFormatter $orderFormatter
+     * @param OrderViewAuthorizationInterface $orderViewAuthorizationInterface
+     */
     public function __construct(
         ShipmentRepositoryInterface $shipmentRepository,
         OrderFormatter $orderFormatter,
@@ -51,8 +57,13 @@ public function resolve(
         array $args = null
     ) {
         $customerId = $context->getUserId();
-        $shipment = $this->shipmentRepository->get($args['shipmentId']);
-        $order = $shipment->getOrder();
+
+        try {
+            $shipment = $this->shipmentRepository->get($args['shipmentId']);
+            $order = $shipment->getOrder();
+        } catch (NoSuchEntityException $e) {
+            throw new GraphQlInputException(__($e->getMessage()));
+        }
 
         if (!$this->orderViewAuthorizationInterface->canView($order, $customerId)) {
             throw new GraphQlInputException(__('Current user is not allowed to print this order'));
diff --git a/Model/Resolver/Shipments.php b/Model/Resolver/Shipments.php
index 4ea8cea..bcc0f97 100644
--- a/Model/Resolver/Shipments.php
+++ b/Model/Resolver/Shipments.php
@@ -11,7 +11,7 @@
 use Magento\Framework\GraphQl\Config\Element\Field;
 use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
 use Magento\Sales\Api\Data\ShipmentInterface;
-use Magento\Sales\Model\Order;
+use Magento\Sales\Api\Data\OrderInterface;
 use Magento\SalesGraphQl\Model\Resolver\Shipments as BaseShipments;
 
 /**
@@ -24,11 +24,11 @@ class Shipments extends BaseShipments
      */
     public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
     {
-        if (!isset($value['model']) && !($value['model'] instanceof Order)) {
+        if (!isset($value['model']) && !($value['model'] instanceof OrderInterface)) {
             throw new LocalizedException(__('"model" value should be specified'));
         }
 
-        /** @var Order $order */
+        /** @var OrderInterface $order */
         $order = $value['model'];
         $shipments = $order->getShipmentsCollection()->getItems();
 
@@ -41,7 +41,7 @@ public function resolve(Field $field, $context, ResolveInfo $info, array $value
         foreach ($shipments as $shipment) {
             $orderShipments[] =
                 [
-                    'id' => base64_encode($shipment->getEntityId()),
+                    'id' => base64_encode((string) $shipment->getEntityId()),
                     'number' => $shipment->getIncrementId(),
                     'comments' => $this->getShipmentComments($shipment),
                     'model' => $shipment,
diff --git a/etc/schema.graphqls b/etc/schema.graphqls
index 04a4fed..6fa855b 100644
--- a/etc/schema.graphqls
+++ b/etc/schema.graphqls
@@ -8,9 +8,9 @@
  */
 
 type Query {
-    orderByInvoice (invoiceId: Int): CustomerOrder @resolver(class: "ScandiPWA\\SalesGraphQl\\Model\\Resolver\\Invoice\\PrintInvoice")
-    orderByShipment (shipmentId: Int): CustomerOrder @resolver(class: "ScandiPWA\\SalesGraphQl\\Model\\Resolver\\Shipment\\PrintShipment")
-    orderByRefund (refundId: Int): CustomerOrder @resolver(class: "ScandiPWA\\SalesGraphQl\\Model\\Resolver\\CreditMemo\\PrintCreditMemo")
+    orderByInvoice (invoiceId: Int!): CustomerOrder @resolver(class: "ScandiPWA\\SalesGraphQl\\Model\\Resolver\\Invoice\\PrintInvoice")
+    orderByShipment (shipmentId: Int!): CustomerOrder @resolver(class: "ScandiPWA\\SalesGraphQl\\Model\\Resolver\\Shipment\\PrintShipment")
+    orderByRefund (refundId: Int!): CustomerOrder @resolver(class: "ScandiPWA\\SalesGraphQl\\Model\\Resolver\\CreditMemo\\PrintCreditMemo")
 }
 
 input CustomerOrdersFilterInput @doc(description: "Identifies the filter to use for filtering orders.") {