diff --git a/src/main/java/ch/zhaw/gartenverwaltung/models/GardenSchedule.java b/src/main/java/ch/zhaw/gartenverwaltung/models/GardenSchedule.java
index a3eccfa..6f63f11 100644
--- a/src/main/java/ch/zhaw/gartenverwaltung/models/GardenSchedule.java
+++ b/src/main/java/ch/zhaw/gartenverwaltung/models/GardenSchedule.java
@@ -147,12 +147,14 @@ public class GardenSchedule {
             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 (checkDate != null) {
+                    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;