diff --git a/backend/src/main/java/core/entities/timemanager/TaskSerie.java b/backend/src/main/java/core/entities/timemanager/TaskSerie.java
index 87df8cd..1cf48e9 100644
--- a/backend/src/main/java/core/entities/timemanager/TaskSerie.java
+++ b/backend/src/main/java/core/entities/timemanager/TaskSerie.java
@@ -15,9 +15,6 @@ public class TaskSerie {
     @OneToMany(fetch = FetchType.EAGER, mappedBy = "taskSerie", orphanRemoval = true)
     List<TaskSerieItem> tasks = new ArrayList<>();
 
-
-
-
     public long getTaskSerieID() {
         return taskSerieID;
     }
diff --git a/backend/src/main/java/core/services/TaskSeriesService.java b/backend/src/main/java/core/services/TaskSeriesService.java
index 4d99d09..fbfbf22 100644
--- a/backend/src/main/java/core/services/TaskSeriesService.java
+++ b/backend/src/main/java/core/services/TaskSeriesService.java
@@ -135,11 +135,7 @@ public class TaskSeriesService {
         task.setTaskSerieItem(null);
         taskSerieItemRepository.delete(item);
         if(taskSerie.getTasks().isEmpty()) {
-            for(TaskSerieItem taskSerieItem : taskSerie.getTasks()) {
-                taskSerieItem.setTaskSerie(null);
-            }
-            taskSerie.getTasks().clear();
-            taskSeriesRepository.delete(taskSerie);
+            taskSeriesRepository.deleteUnreferenced();
         } else if(task.getParent() == null){
             repearIndexing(taskSerie, item.getSeriesIndex());
         }