minor, fix a NPE bug
diff --git a/server-base/src/main/java/org/apache/kylin/rest/service/JobService.java b/server-base/src/main/java/org/apache/kylin/rest/service/JobService.java
index 4306e21..e0d08f9 100644
--- a/server-base/src/main/java/org/apache/kylin/rest/service/JobService.java
+++ b/server-base/src/main/java/org/apache/kylin/rest/service/JobService.java
@@ -550,7 +550,7 @@
         } else {
             String cubeName = CubingExecutableUtil.getCubeName(cubeJob.getParams());
             result.setRelatedCube(cubeName);
-            result.setRelatedObject(cube.getName());
+            result.setRelatedObject(cubeName);
             result.setDisplayCubeName(cubeName);
         }
         result.setRelatedSegment(CubingExecutableUtil.getSegmentId(cubeJob.getParams()));