diff --git a/src/Payment/MollieOrderService.php b/src/Payment/MollieOrderService.php
index 277d7a4f..b336ef56 100644
--- a/src/Payment/MollieOrderService.php
+++ b/src/Payment/MollieOrderService.php
@@ -150,7 +150,12 @@ public function onWebhookAction()
             $this->processRefunds($order, $payment);
             $this->processChargebacks($order, $payment);
             //if the order gets updated to completed at mollie, we need to update the order status
-            if ($order->get_status() === 'processing' && $payment->isCompleted() && method_exists($payment_object, 'onWebhookCompleted')) {
+            if (
+                $order->get_status() === 'processing'
+                && method_exists($payment, 'isCompleted')
+                && $payment->isCompleted()
+                && method_exists($payment_object, 'onWebhookCompleted')
+            ) {
                 $payment_object->onWebhookCompleted($order, $payment, $payment_method_title);
             }
             return;