diff --git a/mailbox-lan/src/main/java/com/biutag/lan/service/WorkService.java b/mailbox-lan/src/main/java/com/biutag/lan/service/WorkService.java
index f939fea..e5a78a8 100644
--- a/mailbox-lan/src/main/java/com/biutag/lan/service/WorkService.java
+++ b/mailbox-lan/src/main/java/com/biutag/lan/service/WorkService.java
@@ -197,6 +197,9 @@ public class WorkService extends ServiceImpl<WorkMapper, Work> {
 
     public boolean updateDone(String mailId, String empNo, String flowName) {
         Work work = getOne(mailId, empNo);
+        if (Objects.isNull(work)) {
+            return false;
+        }
         work.setUpdateTime(LocalDateTime.now()).setWorkState(Work.State.done.name()).setFlowName(flowName);
         return updateById(work);
     }