diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index d7a4cce0..7e6e3567 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -36,12 +36,12 @@ class StLogSerializer(CustomModelSerializer):
             ['is_shutdown', 'sflog', 'duration']
 
     def create(self, validated_data):
-        current_sflog = validated_data.pop('current_sflog')
+        current_sflog_id = validated_data.pop('current_sflog')
         current_note = validated_data.pop('note', '')
         with transaction.atomic():
             validated_data['sflog'] = get_sflog(
                 validated_data['mgroup'], validated_data['start_time'])
-            if current_sflog.id != validated_data['sflog'].id:
+            if current_sflog_id != validated_data['sflog'].id:
                 raise ParseError('值班时间与发生时间不一致')
             instance = super().create(validated_data)
             SfLogExp.objects.create(