diff --git a/__init__.py b/__init__.py
index 4b7600e..ac97cff 100755
--- a/__init__.py
+++ b/__init__.py
@@ -2,7 +2,7 @@ bl_info = {
     "name": "Render Toolbox",
     "description": "Setup outputs and perform cheks for rendering",
     "author": "Samuel Bernou",
-    "version": (2, 0, 0),
+    "version": (2, 0, 1),
     "blender": (5, 2, 0),
     "location": "View3D",
     "warning": "",
diff --git a/fn.py b/fn.py
index 406779f..85cc7ff 100755
--- a/fn.py
+++ b/fn.py
@@ -805,9 +805,11 @@ def apply_collection_states(collection, context=None):
         return ({'WARNING'}, f"No stored state for '{key}'")
         # return {'CANCELLED'}
 
+    ## Collect objects before changing visibility (can invalidate all_objects cache)
+    all_objects = {o.name: o for o in collection.all_objects}
     for obj_name, obj_state in state['objects'].items():
         # obj = context.scene.objects.get(obj_name)
-        obj = collection.all_objects.get(obj_name)
+        obj = all_objects.get(obj_name)
         if obj:
             obj.hide_viewport = obj_state.get('hide_viewport', False)
             obj.hide_render = obj_state.get('hide_render', False)
diff --git a/operators/conform_collection_hierarchy.py b/operators/conform_collection_hierarchy.py
index de508ff..bf4781d 100755
--- a/operators/conform_collection_hierarchy.py
+++ b/operators/conform_collection_hierarchy.py
@@ -103,7 +103,9 @@ def outliner_conform(apply=False, context=None):
                     affected_items['collections'][vlc] = col_attrs
 
         if affect_target in {'ALL', 'OBJECT'}:
-            for obj in ref_collection.all_objects:
+            ## Iterate on a copy: changing visibility can invalidate all_objects cache while iterating
+            ## (iteration then yields None and stops early)
+            for obj in list(ref_collection.all_objects):
                 obj_attrs = []
                 if conform_selectability and obj.hide_select != ref_collection.hide_select:
                     if apply: obj.hide_select = ref_collection.hide_select