diff --git a/capellambse_context_diagrams/collectors/default.py b/capellambse_context_diagrams/collectors/default.py
index 29124c88..91d5c6ac 100644
--- a/capellambse_context_diagrams/collectors/default.py
+++ b/capellambse_context_diagrams/collectors/default.py
@@ -61,7 +61,7 @@ def __init__(
     def process_context(self):
         if (
             self.diagram.display_parent_relation
-            and hasattr(self.diagram.target, "owner")
+            and getattr(self.diagram.target, "owner", None) is not None
             and not isinstance(self.diagram.target.owner, generic.PackageTypes)
         ):
             box = self._make_box(
diff --git a/docs/index.md b/docs/index.md
index f057b3d5..de752e4e 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -178,8 +178,6 @@ Available via `.context_diagram` on a [`ModelObject`][capellambse.model.common.e
               <figcaption>Context diagram of PC Software [PAB]</figcaption>
           </figure>
 
-*   [`pa.PhysicalFunction`][capellambse.model.layers.pa.PhysicalFunction] (PDFB)
-
 -   ??? example "[`pa.PhysicalFunction`][capellambse.model.layers.pa.PhysicalFunction] (PDFB)"
 
           ``` py