diff --git a/SfeduSchedule.Abstractions/ScheduleDTO.CS b/SfeduSchedule.Abstractions/ScheduleDTO.CS
index eb9e40c..ea78d32 100644
--- a/SfeduSchedule.Abstractions/ScheduleDTO.CS
+++ b/SfeduSchedule.Abstractions/ScheduleDTO.CS
@@ -354,7 +354,7 @@ namespace SfeduSchedule
         public string[] UserRoleIds { get; set; }
 
         [JsonPropertyName("lessonTemplateId")]
-        public Guid LessonTemplateId { get; set; }
+        public Guid? LessonTemplateId { get; set; }
 
         [JsonPropertyName("__version")]
         public long Version { get; set; }