diff --git a/backend/src/main/java/com/nttdata/calender/presets/Presets.java b/backend/src/main/java/com/nttdata/calender/presets/Presets.java
index f61cc18..e4ac11c 100644
--- a/backend/src/main/java/com/nttdata/calender/presets/Presets.java
+++ b/backend/src/main/java/com/nttdata/calender/presets/Presets.java
@@ -94,9 +94,9 @@ public class Presets {
         var pref = api.queryFieldsById("\'2\'==\"" + api.getUser() + "\"", queryP.getFieldIds(), formUserPref, null, 0,
                 0);
 
-        api.modifyEntry(pref.get(0).getEntryId(), queryP);
+        if (pref.isEmpty() || pref == null) return false;
 
-        // TODO: Wann soll es false sein? Wenn kein Eintrag is?
+        api.modifyEntry(pref.get(0).getEntryId(), queryP);
         return true;
     }