diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index faf97ea4..6a74d8a0 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -635,7 +635,7 @@ class MlogSerializer(CustomModelSerializer):
         mgroup:Mgroup = attrs['mgroup']
         work_start_time:datetime = attrs['work_start_time']
         handle_date, attrs["shift"] = mgroup.get_shift(work_start_time)
-        if mtask.start_date == mtask.end_date:
+        if mtask and mtask.start_date == mtask.end_date:
             attrs['handle_date'] = mtask.end_date
             if attrs['handle_date'] != handle_date:
                 raise ParseError('任务日期与生产日期不一致')