From 396fd5520fec049176583ac1aa5a0b21d41a9d22 Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Sun, 29 Jan 2023 15:15:00 +1100
Subject: [PATCH] Fix #2349. Be more defensive on invalid smart annotations.

---
 src/ifcopenshell-python/ifcopenshell/util/selector.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ifcopenshell-python/ifcopenshell/util/selector.py b/src/ifcopenshell-python/ifcopenshell/util/selector.py
index fc6672f2d6..3f1e01548c 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/selector.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/selector.py
@@ -238,6 +238,8 @@ class Selector:
                         if key in info and info[key] == value:
                             element = material
                 element = material_definition 
+                if not element:
+                    return None
             except:
                 return
         elif "." in key and key.split(".")[0] == "container":