diff --git a/platform-operate-api/src/main/java/com/lyms/platform/operate/web/facade/CourseFacade.java b/platform-operate-api/src/main/java/com/lyms/platform/operate/web/facade/CourseFacade.java
index 60f933c..a8bfb02 100644
--- a/platform-operate-api/src/main/java/com/lyms/platform/operate/web/facade/CourseFacade.java
+++ b/platform-operate-api/src/main/java/com/lyms/platform/operate/web/facade/CourseFacade.java
@@ -1455,7 +1455,7 @@ public class CourseFacade {
             msgQuery.setId(msgModelRecord.getMsgId());
             List<MsgModel> msgModels= courseEvalService.queryMsgList(msgQuery);
             MsgModel msgModel= msgModels.get(0);
-            msgModel.setReadNum(msgModel.getReadNum()+1);
+            msgModel.setReadNum(msgModel.getReadNum()!=null?msgModel.getReadNum()+1:1);
             courseEvalService.updateMsg(msgModel);
         }
         objectResponse.setObject(msgModelRecord);