diff --git a/multi_user/bl_types/bl_collection.py b/multi_user/bl_types/bl_collection.py
index 1caca1b..3de8af0 100644
--- a/multi_user/bl_types/bl_collection.py
+++ b/multi_user/bl_types/bl_collection.py
@@ -51,10 +51,10 @@ class BlCollection(BlDatablock):
 
         # dump children collections
         collection_children = []
-        for object in pointer.objects:
-            collection_children.append(object.uuid)
+        for child in pointer.children:
+            collection_children.append(child.uuid)
         
-        data['children'] = collection_objects
+        data['children'] = collection_children
 
         # dumper = utils.dump_anything.Dumper()
         # dumper.depth = 2
diff --git a/multi_user/libs/replication b/multi_user/libs/replication
index 1fb67db..63abb55 160000
--- a/multi_user/libs/replication
+++ b/multi_user/libs/replication
@@ -1 +1 @@
-Subproject commit 1fb67db7eab31fa27cc07745250a02428605bdfa
+Subproject commit 63abb5584fff5f43a313af60ce40953cae72f522