s

src/main/java/com/sasiedzi/event/domain/TransactionItemComparator.java

@@ -12,6 +12,7 @@ public class TransactionItemComparator implements Comparator<TransactionItem> {
         if (item1 == null && item2 == null) return 0;
         if (item1 == null) return -1;
         if (item2 == null) return 1;
+        if (item1.getId() == null && item2.getId() == null) return -1;
         if (Objects.equals(item1.getId(), item2.getId())) return 0;
 
         // Teraz porównujemy pola userAccount

src/main/java/com/sasiedzi/event/domain/UserAccountComparator.java

@@ -23,6 +23,7 @@ public class UserAccountComparator implements Comparator<UserAccount> {
         if (ua1 == null && ua2 == null) return 0;
         if (ua1 == null) return -1;
         if (ua2 == null) return 1;
+        if (ua1.getId() == null && ua2.getId() == null) return -1;
         if (Objects.equals(ua1.getId(), ua2.getId())) return 0;
 
         String name1 = ua1.getName();