diff --git a/catalog/controller/payment/btcpay.php b/catalog/controller/payment/btcpay.php
index 88531fd..a5291f1 100644
--- a/catalog/controller/payment/btcpay.php
+++ b/catalog/controller/payment/btcpay.php
@@ -25,6 +25,13 @@ public function index(): string
           true
         );
 
+        if (isset($this->session->data['error_warning'])) {
+          $data['error_warning'] = $this->session->data['error_warning'];
+          unset($this->session->data['error_warning']);
+        } else {
+          $data['error_warning'] = '';
+        }
+
         if ($useModal) {
             $host = $this->config->get('payment_btcpay_url');
             $data['btcpay_host'] = $host;
@@ -63,6 +70,16 @@ public function checkout(): void
           $this->session->data['order_id']
         );
 
+        if (empty($order_info)) {
+          if ($debug) {
+            $this->log->write('Could not load order passed by session, order id: ' . $this->session->data['order_id']);
+          }
+          $this->session->data['error_warning'] = $this->language->get('session_checkout_order_error');
+          $this->response->redirect(
+            $this->url->link('checkout/checkout', '', true)
+          );
+        }
+
         $invoiceId = '';
         $checkoutLink = '';
 
diff --git a/catalog/language/en-gb/payment/btcpay.php b/catalog/language/en-gb/payment/btcpay.php
index 3a2f0f4..4148941 100644
--- a/catalog/language/en-gb/payment/btcpay.php
+++ b/catalog/language/en-gb/payment/btcpay.php
@@ -6,3 +6,4 @@
 $_['invoice_closed_text']  = 'Payment aborted. Please try again or choose a different payment method.';
 $_['invoice_failed_text']  = 'Payment aborted. Error processing the request. Please contact store owner if the problem persists.';
 $_['order_payment_link']  = 'You can check your payment status here: ';
+$_['session_checkout_order_error']  = 'Your cart order id could not be found, please try to log out and in again.';
diff --git a/catalog/view/template/payment/btcpay.twig b/catalog/view/template/payment/btcpay.twig
index 4a191dd..20a7a8c 100644
--- a/catalog/view/template/payment/btcpay.twig
+++ b/catalog/view/template/payment/btcpay.twig
@@ -1,3 +1,6 @@
+{% if error_warning %}
+  <div class="alert alert-danger">{{ error_warning }}</div>
+{% endif %}
 <form action="{{ action }}" method="post">
   <div class="buttons">
     <div class="text-end">
diff --git a/catalog/view/template/payment/btcpay_modal.twig b/catalog/view/template/payment/btcpay_modal.twig
index 58021f6..7919400 100644
--- a/catalog/view/template/payment/btcpay_modal.twig
+++ b/catalog/view/template/payment/btcpay_modal.twig
@@ -13,6 +13,8 @@
       if (data.invoiceId !== undefined) {
         window.btcpay.setApiUrlPrefix('{{ btcpay_host }}');
         window.btcpay.showInvoice(data.invoiceId);
+      } else {
+          showError('{{ invoice_failed_text }}');
       }
       let invoice_paid = false;
       window.btcpay.onModalReceiveMessage(function (event) {
diff --git a/install.json b/install.json
index a985700..4872ba8 100644
--- a/install.json
+++ b/install.json
@@ -1,6 +1,6 @@
 {
   "name": "BTCPay Server payment gateway",
-  "version": "4.2.1",
+  "version": "4.2.2",
   "license": "MIT",
   "author": "BTCPay Server",
   "link": "https://btcpayserver.org"
diff --git a/system/library/btcpay/version.php b/system/library/btcpay/version.php
index d906445..480781d 100644
--- a/system/library/btcpay/version.php
+++ b/system/library/btcpay/version.php
@@ -1,3 +1,3 @@
 <?php
 
-define('BTCPAY_OPENCART_EXTENSION_VERSION', '4.2.1');
+define('BTCPAY_OPENCART_EXTENSION_VERSION', '4.2.2');