diff --git a/apps/enm/tasks.py b/apps/enm/tasks.py
index 450631a5..6910f5f2 100644
--- a/apps/enm/tasks.py
+++ b/apps/enm/tasks.py
@@ -358,6 +358,7 @@ def cal_enstat(type, sflogId, mgroupId, year, month, day, hour, year_s, month_s,
         this_cal_attrs = cal_attrs[:]
 
     mgroup = Mgroup.objects.get(id=mgroupId)
+    sflog = None  # 默认无班次
     if sflogId:
         sflog = SfLog.objects.get(id=sflogId)
     elif year and month and day and hour is not None: