diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index cc104747..d7a4cce0 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -41,7 +41,7 @@ class StLogSerializer(CustomModelSerializer):
         with transaction.atomic():
             validated_data['sflog'] = get_sflog(
                 validated_data['mgroup'], validated_data['start_time'])
-            if current_sflog != validated_data['sflog']:
+            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(