diff --git a/dlp-drugtesting-biz/src/main/java/digital/laboratory/platform/inspection/vo/TestRecordSampleDataVO.java b/dlp-drugtesting-biz/src/main/java/digital/laboratory/platform/inspection/vo/TestRecordSampleDataVO.java
index 3e804e5..42cb248 100644
--- a/dlp-drugtesting-biz/src/main/java/digital/laboratory/platform/inspection/vo/TestRecordSampleDataVO.java
+++ b/dlp-drugtesting-biz/src/main/java/digital/laboratory/platform/inspection/vo/TestRecordSampleDataVO.java
@@ -74,6 +74,9 @@ public class TestRecordSampleDataVO {
     private List<TestRecordSampleDataExpand> expandList;
 
     public String getIsDetected() {
+        if (isDetected == null) {
+            return null;
+        }
         return isDetected.equals(1) ? TestRecordSampleDataConstant.IS : TestRecordSampleDataConstant.NO;
     }
 }