diff --git a/backend-dart/lib/infrastructure/persistence/mapper/time_entry_dbo_mapper.dart b/backend-dart/lib/infrastructure/persistence/mapper/time_entry_dbo_mapper.dart
index 5e6f75d..9afe474 100644
--- a/backend-dart/lib/infrastructure/persistence/mapper/time_entry_dbo_mapper.dart
+++ b/backend-dart/lib/infrastructure/persistence/mapper/time_entry_dbo_mapper.dart
@@ -11,7 +11,7 @@ class TimeEntryDboMapper {
         TimeEntry(
           id: target.id!,
           startTime: target.startTime!,
-          endTime: target.endTime!,
+          endTime: target.endTime,
           description: target.description,
           userId: target.userId!,
           projectId: target.projectId!,