diff --git a/epmet-module/data-report/data-report-server/src/main/resources/mapper/screen/ScreenDifficultyDataDao.xml b/epmet-module/data-report/data-report-server/src/main/resources/mapper/screen/ScreenDifficultyDataDao.xml
index a342420f2d..dc1320fa4d 100644
--- a/epmet-module/data-report/data-report-server/src/main/resources/mapper/screen/ScreenDifficultyDataDao.xml
+++ b/epmet-module/data-report/data-report-server/src/main/resources/mapper/screen/ScreenDifficultyDataDao.xml
@@ -12,7 +12,7 @@
             ROUND(diff.EVENT_COST_TIME/60,0) AS totalHours,
             diff.EVENT_SOURCE AS gridName,
             diff.EVENT_IMG_URL AS imgUrl,
-            diff.EVENT_CATEGORY_NAME AS categoryName,
+            IFNULL(diff.EVENT_CATEGORY_NAME,'') AS categoryName,
             diff.EVENT_RE_ORG AS handleDepts,
             diff.EVENT_RE_ORG AS handleCount
         FROM