diff --git a/src/main/java/ch/zhaw/gartenverwaltung/models/GardenSchedule.java b/src/main/java/ch/zhaw/gartenverwaltung/models/GardenSchedule.java
index a3eccfa..56a3a54 100644
--- a/src/main/java/ch/zhaw/gartenverwaltung/models/GardenSchedule.java
+++ b/src/main/java/ch/zhaw/gartenverwaltung/models/GardenSchedule.java
@@ -146,13 +146,17 @@ public class GardenSchedule {
             dayTaskList.add(new ArrayList<>());
             final int finalI = i;
             weekTasks.forEach(task -> {
-                LocalDate checkDate = task.getNextExecution();
-                do {
-                    if (date.equals(checkDate) && !date.isAfter(task.getEndDate().orElse(LocalDate.MIN))) {
-                        dayTaskList.get(finalI).add(task);
-                    }
-                    checkDate = checkDate.plusDays(task.getInterval().orElse(0));
-                } while (!(task.getInterval().orElse(0) == 0) && checkDate.isBefore(LocalDate.now().plusDays(listLength)));
+                if (task.getNextExecution() == null) {
+                    task.isDone();
+                } else {
+                    LocalDate checkDate = task.getNextExecution();
+                    do {
+                        if (date.equals(checkDate) && !date.isAfter(task.getEndDate().orElse(LocalDate.MIN))) {
+                            dayTaskList.get(finalI).add(task);
+                        }
+                        checkDate = checkDate.plusDays(task.getInterval().orElse(0));
+                    } while (!(task.getInterval().orElse(0) == 0) && checkDate.isBefore(LocalDate.now().plusDays(listLength)));
+                }
             });
         }
         return dayTaskList;
@@ -187,6 +191,6 @@ public class GardenSchedule {
      * @return a sorted coppy of the given Tasklist
      */
     private List<Task> getSortedTaskList(List<Task> taskList, Comparator<Task> comparator) {
-        return taskList.stream().sorted(comparator).collect(Collectors.toList());
+        return taskList.stream().filter(task -> task.getNextExecution() != null).sorted(comparator).collect(Collectors.toList());
     }
 }