diff --git a/sync/models/base.py b/sync/models/base.py
index 46955a1..cefd9f6 100644
--- a/sync/models/base.py
+++ b/sync/models/base.py
@@ -40,9 +40,15 @@ class BaseModel(models.Model):
 
     def update_data_access_list(self):
         related_instances = self.sharing_related_instances()
-        data_access_ids = [instance.data_access_ids for instance in related_instances if isinstance(instance, BaseModel)]
-        data_access_ids.extend(self.data_access_ids)
-        self.data_access_ids = data_access_ids
+        data_access_ids = {}
+        for instance in related_instances:
+            if isinstance(instance, BaseModel) and instance.data_access_ids:
+                data_access_ids.append(instance.data_access_ids)
+
+        # print(f'related_instances = {related_instances}')
+        # data_access_ids = [instance.data_access_ids for instance in related_instances if isinstance(instance, BaseModel)]
+        # data_access_ids.extend(self.data_access_ids)
+        self.data_access_ids = list(data_access_ids)
 
         # DataAccess = apps.get_model('sync', 'DataAccess')
         # data_accesses = DataAccess.objects.filter(model_id__in=related_ids)
diff --git a/sync/signals.py b/sync/signals.py
index 7e275a8..0b9c6c4 100644
--- a/sync/signals.py
+++ b/sync/signals.py
@@ -11,7 +11,6 @@ from .ws_sender import websocket_sender
 from .registry import device_registry, related_users_registry
 
 import logging
-import sys
 import traceback
 
 logger = logging.getLogger(__name__)
@@ -34,29 +33,13 @@ def presave_handler(sender, instance, **kwargs):
             return
 
         users = related_users(instance)
-
         related_users_registry.register(instance.id, users)
 
         if signal == pre_save:
             detect_foreign_key_changes_for_shared_instances(sender, instance)
-            sig_type = 'pre_save'
-        elif signal == pre_delete:
-            # if hasattr(instance, 'id'):
-            #     try:
-            #         data_access_list = DataAccess.objects.filter(model_id=instance.id)
-            #         if data_access_list:
-            #             logger.info(f'>>> {instance.__class__.__name__} {instance.id} : delete {data_access_list.count()} DataAccess')
-            #         data_access_list.delete()
-            #     except Exception as e:
-            #         logger.info(f'*** ERRRRRRR: {e}')
-            #         logger.info(traceback.format_exc())
-            #         raise
-
-            sig_type = 'pre_delete'
-        # logger.info(f'* {sig_type} : {instance.__class__.__name__} > impacted users = {users}')
 
     except Exception as e:
-        logger.info(f'*** ERROR: {e}')
+        logger.info(f'*** presave_handler ERROR: {e}')
         raise
 
 @receiver([post_save, post_delete])
@@ -344,12 +327,10 @@ def related_users(instance):
     elif isinstance(instance, BaseModel):
         users.add(instance.related_user)
         data_access_list = DataAccess.objects.filter(id__in=instance.data_access_ids)
-
         # print(f'instance = {instance.__class__.__name__}, data access count = {len(data_access_list)}')
         for data_access in data_access_list:
             users.add(data_access.related_user)
             users.update(data_access.shared_with.all())
-
         if isinstance(instance, DataAccess):
             users.update(instance.shared_with.all())
 
diff --git a/sync/views.py b/sync/views.py
index c4dd8e3..100ff72 100644
--- a/sync/views.py
+++ b/sync/views.py
@@ -340,14 +340,17 @@ class LogProcessingResult:
         shared = defaultdict(dict)
         grants = defaultdict(dict)
 
+        try:
         # Process each grant instance
-        for model_name, instances in self.shared_instances.items():
-            for model_id, instance in instances.items():
-                serializer = get_serializer(instance, model_name)
-                shared[model_name][model_id] = serializer.data
+            for model_name, instances in self.shared_instances.items():
+                for model_id, instance in instances.items():
+                    serializer = get_serializer(instance, model_name)
+                    shared[model_name][model_id] = serializer.data
 
-                add_children_hierarchy(instance, grants)
-                add_parents_recursively(instance, grants)
+                    add_children_hierarchy(instance, grants)
+                    add_parents_recursively(instance, grants)
+        except Exception as e:
+            print(f'ERR = {e}')
 
         # Convert to lists
         for model_name in shared:
@@ -363,7 +366,7 @@ class LogProcessingResult:
         revocations_parents_organizer = HierarchyOrganizer()
 
         # logger.info(f'$$$ process_revocations: {len(self.revoke_info)}')
-        sync_models = getattr(settings, 'SYNC_MODEL_CHILDREN_SHARING', {})
+        # sync_models = getattr(settings, 'SYNC_MODEL_CHILDREN_SHARING', {})
 
         # First, collect all revocations
         for model_name, items in self.revoke_info.items():