diff --git a/apps/wpm/services.py b/apps/wpm/services.py
index d0f39472..e3951aeb 100644
--- a/apps/wpm/services.py
+++ b/apps/wpm/services.py
@@ -385,6 +385,8 @@ def mlog_submit(mlog: Mlog, user: User, now: Union[datetime.datetime, None]):
     mlog.submit_user = user
     mlog.stored_notok = stored_notok
     mlog.stored_mgroup = stored_mgroup
+    if mlog.work_end_time is None:
+        mlog.work_end_time = now
     mlog.save()
 
     # 更新任务进度