diff --git a/core/admin.py b/core/admin.py
index 8f5f69ea..8a1c0326 100644
--- a/core/admin.py
+++ b/core/admin.py
@@ -410,6 +410,7 @@ class ProductAdmin(FieldsetsMixin, ActivationActionsMixin, ModelAdmin):  # type:
         "sku",
     )
     readonly_fields = (
+        "sku",
         "slug",
         "uuid",
         "modified",
diff --git a/core/serializers/detail.py b/core/serializers/detail.py
index 51a15e17..f9c9ef90 100644
--- a/core/serializers/detail.py
+++ b/core/serializers/detail.py
@@ -3,7 +3,6 @@ from collections import defaultdict
 from contextlib import suppress
 from typing import Collection, Any
 
-from django.contrib.auth.models import AnonymousUser
 from django.core.cache import cache
 from django.db.models.functions import Length
 from rest_framework.fields import JSONField, SerializerMethodField
diff --git a/core/vendors/__init__.py b/core/vendors/__init__.py
index b4eeafbd..8bc2183c 100644
--- a/core/vendors/__init__.py
+++ b/core/vendors/__init__.py
@@ -1,5 +1,6 @@
 import gzip
 import json
+import traceback
 from contextlib import suppress
 from datetime import datetime
 from decimal import Decimal
@@ -7,6 +8,7 @@ from io import BytesIO
 from math import ceil, log10
 from typing import Any
 
+from celery.utils.log import get_task_logger
 from constance import config
 from django.conf import settings
 from django.core.files.base import ContentFile
@@ -28,6 +30,8 @@ from core.models import (
 from payments.errors import RatesError
 from payments.utils import get_rates
 
+async_logger = get_task_logger(__name__)
+
 
 class NotEnoughBalanceError(Exception):
     """
@@ -416,9 +420,11 @@ class AbstractVendor:
 
     def process_attribute(self, key: str, value: Any, product: Product, attr_group: AttributeGroup) -> None:
         if not value:
+            async_logger.warning(f"No value for attribute {key!r} at {product.name!r}...")
             return
 
         if not attr_group:
+            async_logger.warning(f"No group for attribute {key!r} at {product.name!r}...")
             return
 
         if key in self.blocked_attributes:
@@ -444,6 +450,8 @@ class AbstractVendor:
             attribute.value_type = attr_value_type
             attribute.save()
         except IntegrityError:
+            async_logger.warning(f"IntegrityError while processing attribute {key!r}...")
+            async_logger.warning(traceback.format_exc())
             return
 
         attribute.save()