diff --git a/app/components/modals/cropper-modal.js b/app/components/modals/cropper-modal.js
index b75ece6d0fa..6d2f040f98f 100644
--- a/app/components/modals/cropper-modal.js
+++ b/app/components/modals/cropper-modal.js
@@ -8,7 +8,7 @@ export default class extends ModalBase {
   onVisible() {
     const viewport = {};
     const factor = 150;
-    const aspectRatio = this.getWithDefault('aspectRatio', [2, 1]);
+    const aspectRatio = this.get('aspectRatio') ?? [2, 1];
     viewport.width = aspectRatio[0] * factor;
     viewport.height = aspectRatio[1] * factor;
     viewport.type = 'square';
diff --git a/app/components/orders/order-summary.js b/app/components/orders/order-summary.js
index 596c2ce46f0..3c9341a73b9 100644
--- a/app/components/orders/order-summary.js
+++ b/app/components/orders/order-summary.js
@@ -14,7 +14,7 @@ export default class OrderSummary extends Component.extend(FormMixin) {
   @computed('data.tickets', 'data.tickets.@each.attendees')
   get total() {
     return sumBy(this.data.tickets.toArray(),
-      ticket => (ticket.getWithDefault('price', 0) - ticket.getWithDefault('discount', 0)) * ticket.getWithDefault('attendees.length', 0)
+      ticket => (ticket.get('price') ?? 0 - ticket.get('discount') ?? 0) * ticket.get('attendees.length') ?? 0
     );
   }
 
diff --git a/app/controllers/events/view/tickets/add-order.js b/app/controllers/events/view/tickets/add-order.js
index 74a6db29b41..3a9537c5382 100644
--- a/app/controllers/events/view/tickets/add-order.js
+++ b/app/controllers/events/view/tickets/add-order.js
@@ -8,7 +8,7 @@ export default class AddOrderController extends Controller {
   @computed('model.tickets.@each.orderQuantity')
   get hasTicketsInOrder() {
     return sumBy(this.model.tickets.toArray(),
-      ticket => ticket.getWithDefault('orderQuantity', 0)
+      ticket => ticket.get('orderQuantity') ?? 0
     ) > 0;
   }
 
diff --git a/app/router.js b/app/router.js
index 653414feddc..f1d6a0bb994 100644
--- a/app/router.js
+++ b/app/router.js
@@ -24,7 +24,7 @@ class Router extends RouterScroll {
   _trackPage() {
     scheduleOnce('afterRender', this, () => {
       const page = this.url;
-      const title = this.getWithDefault('currentRouteName', 'unknown');
+      const title = this.get('currentRouteName') ?? 'unknown';
       this.metrics.trackPage({ page, title });
       this.set('session.currentRouteName', title);
     });