diff --git a/modules/ppcp-button/resources/js/modules/Entity/BookingProduct.js b/modules/ppcp-button/resources/js/modules/Entity/BookingProduct.js
index 36e16a4cd..4245bcb6c 100644
--- a/modules/ppcp-button/resources/js/modules/Entity/BookingProduct.js
+++ b/modules/ppcp-button/resources/js/modules/Entity/BookingProduct.js
@@ -3,16 +3,14 @@ import Product from "./Product";
 class BookingProduct extends Product {
 
     constructor(id, quantity, booking, extra) {
-        super(id, quantity, null);
+        super(id, quantity, null, extra);
         this.booking = booking;
-        this.extra = extra;
     }
 
     data() {
         return {
             ...super.data(),
-            booking: this.booking,
-            extra: this.extra
+            booking: this.booking
         }
     }
 }