diff --git a/src/main/java/de/infinimotion/backend/endpoint/OrderTx.java b/src/main/java/de/infinimotion/backend/endpoint/OrderTx.java
index 4470427..2c159f5 100644
--- a/src/main/java/de/infinimotion/backend/endpoint/OrderTx.java
+++ b/src/main/java/de/infinimotion/backend/endpoint/OrderTx.java
@@ -56,10 +56,11 @@ public class OrderTx {
         return orderTransaction;
     }
 
-    private boolean checkDuplicateTickets(List<Eintrittskarte> tickets1, List<Eintrittskarte> tickets2) {
-        List<Eintrittskarte> tickets = new LinkedList<>(tickets1);
-        tickets.addAll(tickets2);
-        return tickets.stream().anyMatch(ticket -> tickets.stream()
+    private boolean checkDuplicateTickets(List<Eintrittskarte> existingTickets, List<Eintrittskarte> newTickets) {
+        List<Eintrittskarte> tickets = new LinkedList<>(existingTickets);
+        tickets.addAll(newTickets);
+
+        return newTickets.stream().anyMatch(ticket -> tickets.stream()
                 .anyMatch(otherTicket ->
                         ticket != otherTicket && Objects.equals(ticket.getSeat().getId(), otherTicket.getSeat().getId())));
     }