diff --git a/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/contactdiary/model/ContactDiaryElement.kt b/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/contactdiary/model/ContactDiaryElement.kt
index 0d4af5f510f41a265f865f4df926ab5b8657a9fd..ec1a863b74e3e3a09b905aba791f2219a05a2c0d 100644
--- a/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/contactdiary/model/ContactDiaryElement.kt
+++ b/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/contactdiary/model/ContactDiaryElement.kt
@@ -9,9 +9,9 @@ interface ContactDiaryElement {
     val people: List<Person>
     val locations: List<Location>
 
-    val numberOfPersons: Int?
-        get() = people?.size
+    val numberOfPersons: Int
+        get() = people.size
 
-    val numberOfLocations: Int?
-        get() = locations?.size
+    val numberOfLocations: Int
+        get() = locations.size
 }