diff --git a/backend/src/main/java/io/metersphere/track/service/TestPlanService.java b/backend/src/main/java/io/metersphere/track/service/TestPlanService.java
index 01b8af27f3..7ae31d1ea3 100644
--- a/backend/src/main/java/io/metersphere/track/service/TestPlanService.java
+++ b/backend/src/main/java/io/metersphere/track/service/TestPlanService.java
@@ -542,10 +542,14 @@ public class TestPlanService {
         String eTime = String.valueOf(endTime);
         if (!sTime.equals("null")) {
             start = sdf.format(new Date(Long.parseLong(sTime)));
+        } else {
+            start = "";
         }
         String end = null;
         if (!eTime.equals("null")) {
             end = sdf.format(new Date(Long.parseLong(eTime)));
+        } else {
+            end = "";
         }
         String context = "";
         if (StringUtils.equals(NoticeConstants.CREATE, type)) {