diff --git a/src/sequence_diagram/visitor/translation_unit_visitor.cc b/src/sequence_diagram/visitor/translation_unit_visitor.cc
index 1db588550..34a530684 100644
--- a/src/sequence_diagram/visitor/translation_unit_visitor.cc
+++ b/src/sequence_diagram/visitor/translation_unit_visitor.cc
@@ -1708,7 +1708,9 @@ translation_unit_visitor::create_class_model(clang::CXXRecordDecl *cls)
                 .get_participant<clanguml::sequence_diagram::model::class_>(
                     *id_opt);
 
-        assert(parent_class);
+        if (!parent_class) {
+            return {};
+        }
 
         c.set_namespace(ns);
         if (cls->getNameAsString().empty()) {
diff --git a/uml/class/filter_visitor_hierarchy_class.yml b/uml/class/filter_visitor_hierarchy_class.yml
index 1985e5c17..2da58f4aa 100644
--- a/uml/class/filter_visitor_hierarchy_class.yml
+++ b/uml/class/filter_visitor_hierarchy_class.yml
@@ -3,7 +3,7 @@ title: Diagram filter visitor class hierarchy
 include_relations_also_as_members: true
 generate_packages: true
 glob:
-  - src/common/model/diagram_filter.cc
+  - src/common/model/filters/*.cc
 include:
   namespaces:
     - clanguml