diff --git a/backend/src/main/java/io/metersphere/api/dto/definition/request/assertions/MsAssertions.java b/backend/src/main/java/io/metersphere/api/dto/definition/request/assertions/MsAssertions.java
index 1ebf31c486..33c0144798 100644
--- a/backend/src/main/java/io/metersphere/api/dto/definition/request/assertions/MsAssertions.java
+++ b/backend/src/main/java/io/metersphere/api/dto/definition/request/assertions/MsAssertions.java
@@ -59,7 +59,7 @@ public class MsAssertions extends MsTestElement {
             );
         }
 
-        if (this.getDuration().isValid()) {
+        if (this.getDuration() != null && this.getDuration().isValid()) {
             hashTree.add(durationAssertion(this.getDuration()));
         }
     }