diff --git a/src/blenderbim/blenderbim/bim/module/pset/operator.py b/src/blenderbim/blenderbim/bim/module/pset/operator.py
index f5137c36e4..340a6b9f8c 100644
--- a/src/blenderbim/blenderbim/bim/module/pset/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/pset/operator.py
@@ -223,7 +223,7 @@ class EnablePsetEditing(bpy.types.Operator):
                     new.is_selected = enum in selected_enum_items
             else:
                 if prop.is_a("IfcPropertySingleValue"):
-                    value = prop.NominalValue.wrappedValue
+                    value = prop.NominalValue.wrappedValue if prop.NominalValue else None
                 elif prop.is_a("IfcPhysicalSimpleQuantity"):
                     value = prop[3]
                 new_prop = self.props.properties.add()