diff --git a/hb_server/apps/qm/serializers.py b/hb_server/apps/qm/serializers.py
index 7762119..1593b64 100644
--- a/hb_server/apps/qm/serializers.py
+++ b/hb_server/apps/qm/serializers.py
@@ -113,7 +113,7 @@ class TestRecordUpdateSerializer(serializers.ModelSerializer):
 
     def update(self, instance, validated_data):
         with transaction.atomic():
-            record_data = validated_data.pop(validated_data)
+            record_data = validated_data.pop('record_data')
             for attr, value in validated_data.items():
                 setattr(instance, attr, value)
             instance.save()