diff --git a/BackEnd/src/main/java/studycave/studycaverestservice/model/test/Test.java b/BackEnd/src/main/java/studycave/studycaverestservice/model/test/Test.java
index 25fe12c..4f12185 100644
--- a/BackEnd/src/main/java/studycave/studycaverestservice/model/test/Test.java
+++ b/BackEnd/src/main/java/studycave/studycaverestservice/model/test/Test.java
@@ -6,6 +6,7 @@ import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
+import org.springframework.lang.Nullable;
 import studycave.studycaverestservice.model.studyGroup.StudyGroup;
 import studycave.studycaverestservice.model.test.question.Question;
 import studycave.studycaverestservice.model.userActivity.UserActivity;
@@ -59,8 +60,10 @@ public class Test {
     @OneToMany(fetch = FetchType.LAZY, mappedBy = "test", cascade = CascadeType.ALL)
     private List<UserActivity> activity = new ArrayList<>();
 
+    @Nullable
     private Long availableFrom = null;
 
+    @Nullable
     private Long availableTo = null;