diff --git a/app/models/collection.py b/app/models/collection.py
index 5b0f226..6c631e9 100644
--- a/app/models/collection.py
+++ b/app/models/collection.py
@@ -37,6 +37,10 @@ class Collection(BaseModel):
     def active_sections(self):
         return [section for section in self.sections if not section.is_deleted]
 
+    @property
+    def active_children(self):
+        return [child for child in self.children if not child.is_deleted]
+
     @property
     def book_id(self):
         return self.version.book_id
diff --git a/app/templates/book/collection_view.html b/app/templates/book/collection_view.html
index e7557e6..c0b8a49 100644
--- a/app/templates/book/collection_view.html
+++ b/app/templates/book/collection_view.html
@@ -81,7 +81,7 @@
               {% endif %}
             {% endif %}
             {% if access_to_create_section %}
-              {% if collection.children|length ==0  or collection.children|length ==0 and collection.is_leaf %}
+              {% if collection.active_children|length ==0  or collection.active_children|length ==0 and collection.is_leaf %}
                 <li>
                     <button type="button" id="callAddSectionModal" data-modal-target="add-section-modal" data-modal-toggle="add-section-modal" data-collection-id="{{collection.id}}" data-sub-collection-id="_"  class="w-full block px-4 py-2 hover:bg-gray-100 dark:hover:bg-gray-600 dark:hover:text-white">New Section</button>
                 </li>
@@ -155,7 +155,7 @@
     <p class=" text-sm mb-3">{% if book.about==None %}About text{% else %}{{book.about}}{% endif %}</p>
     {% for collection in book.versions[-1].children_collections if not collection.is_root and not collection.is_deleted %}
     <p class="my-3 underline" id="collection-{{collection.label}}">#{{collection.label}}</p>
-    {% if not collection.is_leaf and not collection.children %}
+    {% if not collection.is_leaf and not collection.active_children %}
     <p class="ml-3 my-3 italic text-sm">Collection is empty</p>
     {% endif %}
       {{recursive_render("book/components/sub_collection_preview_content.html",collection,book)|safe}}
diff --git a/app/templates/book/components/sub_collection_preview_content.html b/app/templates/book/components/sub_collection_preview_content.html
index 8ca2ca0..b2724b0 100644
--- a/app/templates/book/components/sub_collection_preview_content.html
+++ b/app/templates/book/components/sub_collection_preview_content.html
@@ -1,14 +1,14 @@
 {% if not collection.is_leaf %}
 <!-- if collection has sub_collection make for loop for it -->
-{% for sub_collection in collection.children if not sub_collection.is_deleted%}
+{% for sub_collection in collection.active_children if not sub_collection.is_deleted%}
 <p class="my-3" id="collection-{{sub_collection.label}}">
   ##{{sub_collection.label}}
 </p>
-{% if not sub_collection.active_sections and not sub_collection.children %}
+{% if not sub_collection.active_sections and not sub_collection.active_children %}
 <p class="ml-3 my-3 italic text-sm">This sub collection is empty</p>
 {% endif %}
 <!-- prettier-ignore -->
-{% if sub_collection.children %}
+{% if sub_collection.active_children %}
 {{recursive_render("book/components/sub_collection_preview_content.html",sub_collection,book)|safe}}
 {% else %}
 <!-- prettier-ignore -->
diff --git a/app/templates/book/components/sub_collection_tab_content.html b/app/templates/book/components/sub_collection_tab_content.html
index b935b00..7427364 100644
--- a/app/templates/book/components/sub_collection_tab_content.html
+++ b/app/templates/book/components/sub_collection_tab_content.html
@@ -3,7 +3,7 @@
   <!-- if collection has sub_collection make for loop for it -->
   <!-- Nested accordion -->
   <!-- prettier-ignore -->
-  {% for sub_collection in collection.children if not sub_collection.is_deleted%}
+  {% for sub_collection in collection.active_children if not sub_collection.is_deleted%}
   <div id="accordion-nested-collapse" data-accordion="open">
     <!-- prettier-ignore -->
     <div class="flex items-center justify-start w-full font-medium text-left text-gray-500 focus:ring-4 focus:ring-gray-200 dark:focus:ring-gray-800 dark:text-gray-400">
@@ -38,11 +38,11 @@
 
         {% if access_to_create_collections or access_to_update_collections or access_to_create_section %}
           <ul class="py-2 text-sm text-gray-700 dark:text-gray-200">
-            {% if access_to_create_section and sub_collection.is_leaf and not sub_collection.children %}
+            {% if access_to_create_section and sub_collection.is_leaf and not sub_collection.active_children %}
               <li>
                 <button type="button" id="callAddSectionModal" data-modal-target="add-section-modal" data-modal-toggle="add-section-modal" data-collection-id="{{collection.id}}" data-sub-collection-id="{{sub_collection.id}}" class="w-full block px-4 py-2 hover:bg-gray-100 dark:hover:bg-gray-600 dark:hover:text-white"> New Section </button>
               </li>
-            {% elif not sub_collection.is_leaf and not sub_collection.children %}
+            {% elif not sub_collection.is_leaf and not sub_collection.active_children %}
               {% if access_to_create_section %}
                 <li>
                   <button type="button" id="callAddSectionModal" data-modal-target="add-section-modal" data-modal-toggle="add-section-modal" data-collection-id="{{collection.id}}" data-sub-collection-id="{{sub_collection.id}}" class="w-full block px-4 py-2 hover:bg-gray-100 dark:hover:bg-gray-600 dark:hover:text-white"> New Section </button>
@@ -92,7 +92,7 @@
     </div>
     <!-- prettier-ignore -->
     <div id="accordion-nested-collapse-body-{{sub_collection.parent.id}}-{{sub_collection.id}}" class="hidden" aria-labelledby="accordion-nested-collapse-heading-{{sub_collection.id}}">
-    {% if sub_collection.children %}
+    {% if sub_collection.active_children %}
         {{recursive_render("book/components/sub_collection_tab_content.html",sub_collection,book)|safe}}
     {% else %}
         <div class="ml-6">
diff --git a/app/templates/book/modals/access_level_modal.html b/app/templates/book/modals/access_level_modal.html
index d213cc8..2fe3328 100644
--- a/app/templates/book/modals/access_level_modal.html
+++ b/app/templates/book/modals/access_level_modal.html
@@ -34,7 +34,7 @@
                       <span class="text-center dark:text-gray-300">{{ collection.label }}</span>
                     </div>
 
-                    {% for sub_collection in collection.children %}
+                    {% for sub_collection in collection.active_children %}
                       <ul class="ml-4">
                         <li>
                           <div class="flex items-center space-x-2">
diff --git a/app/views/book/collection.py b/app/views/book/collection.py
index 13e58b9..2d2763d 100644
--- a/app/views/book/collection.py
+++ b/app/views/book/collection.py
@@ -188,8 +188,8 @@ def collection_delete(book_id: int, collection_id: int):
     collection: m.Collection = db.session.get(m.Collection, collection_id)
 
     collection.is_deleted = True
-    if collection.children:
-        for child in collection.children:
+    if collection.active_children:
+        for child in collection.active_children:
             child: m.Collection
             delete_nested_collection_entities(child)
             log(log.INFO, "Delete subcollection [%s]", collection.id)