diff --git a/plugins/woocommerce/changelog/BL-prevent-non-orders-on-order-received-page b/plugins/woocommerce/changelog/BL-prevent-non-orders-on-order-received-page
new file mode 100644
index 0000000000000..7e40a6cee1535
--- /dev/null
+++ b/plugins/woocommerce/changelog/BL-prevent-non-orders-on-order-received-page
@@ -0,0 +1,4 @@
+Significance: minor
+Type: fix
+
+Avoid a fatal error on the order received page if the order ID is not for a valid order.
diff --git a/plugins/woocommerce/includes/shortcodes/class-wc-shortcode-checkout.php b/plugins/woocommerce/includes/shortcodes/class-wc-shortcode-checkout.php
index 1915c580ffc03..40b94331095d6 100644
--- a/plugins/woocommerce/includes/shortcodes/class-wc-shortcode-checkout.php
+++ b/plugins/woocommerce/includes/shortcodes/class-wc-shortcode-checkout.php
@@ -271,7 +271,7 @@ private static function order_received( $order_id = 0 ) {
 		if ( $order_id > 0 ) {
 			$order = wc_get_order( $order_id );
 
-			if ( ! $order || ! hash_equals( $order->get_order_key(), $order_key ) ) {
+			if ( ( ! $order instanceof WC_Order ) || ! hash_equals( $order->get_order_key(), $order_key ) ) {
 				$order = false;
 			}
 		}
diff --git a/plugins/woocommerce/includes/wc-cart-functions.php b/plugins/woocommerce/includes/wc-cart-functions.php
index 94fba81e7fd9b..9c883491d40d1 100644
--- a/plugins/woocommerce/includes/wc-cart-functions.php
+++ b/plugins/woocommerce/includes/wc-cart-functions.php
@@ -176,7 +176,7 @@ function wc_clear_cart_after_payment() {
 		if ( $order_id > 0 ) {
 			$order = wc_get_order( $order_id );
 
-			if ( $order && hash_equals( $order->get_order_key(), $order_key ) ) {
+			if ( $order instanceof WC_Order && hash_equals( $order->get_order_key(), $order_key ) ) {
 				WC()->cart->empty_cart();
 			}
 		}
@@ -185,7 +185,7 @@ function wc_clear_cart_after_payment() {
 	if ( WC()->session->order_awaiting_payment > 0 ) {
 		$order = wc_get_order( WC()->session->order_awaiting_payment );
 
-		if ( $order && $order->get_id() > 0 ) {
+		if ( $order instanceof WC_Order && $order->get_id() > 0 ) {
 			// If the order has not failed, or is not pending, the order must have gone through.
 			if ( ! $order->has_status( array( 'failed', 'pending', 'cancelled' ) ) ) {
 				WC()->cart->empty_cart();