diff --git a/src/blenderbim/blenderbim/bim/module/model/product.py b/src/blenderbim/blenderbim/bim/module/model/product.py
index 011fdeedb5..2f044de88c 100644
--- a/src/blenderbim/blenderbim/bim/module/model/product.py
+++ b/src/blenderbim/blenderbim/bim/module/model/product.py
@@ -439,6 +439,7 @@ class LoadTypeThumbnails(bpy.types.Operator, tool.Ifc.Operator):
                     y_offset = (size / 2) - (height / 2)
                     draw.rectangle([x_offset, y_offset, width + x_offset, height + y_offset], outline="white", width=2)
                     current_thickness = 0
+                    del thicknesses[-1]
                     for thickness in thicknesses:
                         current_thickness += thickness
                         if element.is_a("IfcSlabType"):
diff --git a/src/blenderbim/blenderbim/bim/module/model/ui.py b/src/blenderbim/blenderbim/bim/module/model/ui.py
index 979a0150be..6fa5aa670c 100644
--- a/src/blenderbim/blenderbim/bim/module/model/ui.py
+++ b/src/blenderbim/blenderbim/bim/module/model/ui.py
@@ -76,12 +76,16 @@ class LaunchTypeManager(bpy.types.Operator):
             row = box.row()
             row.template_icon(icon_value=relating_type["icon_id"], scale=4)
 
-            row = box.row()
+            row = box.row(align=True)
+
             op = row.operator("bim.add_constr_type_instance", icon="ADD")
             op.from_invoke = True
             op.ifc_class = relating_type["ifc_class"]
             op.relating_type_id = relating_type["id"]
 
+            op = row.operator("bim.remove_type", icon="X", text="")
+            op.element = relating_type["id"]
+
 
 class BIM_PT_authoring(Panel):
     bl_label = "Architectural"
diff --git a/src/blenderbim/blenderbim/bim/module/type/__init__.py b/src/blenderbim/blenderbim/bim/module/type/__init__.py
index 8e5b44357b..b164fc7b5e 100644
--- a/src/blenderbim/blenderbim/bim/module/type/__init__.py
+++ b/src/blenderbim/blenderbim/bim/module/type/__init__.py
@@ -21,12 +21,13 @@ from . import ui, prop, operator
 
 classes = (
     operator.AssignType,
-    operator.UnassignType,
-    operator.EnableEditingType,
     operator.DisableEditingType,
+    operator.EnableEditingType,
+    operator.RemoveType,
     operator.SelectSimilarType,
-    operator.SelectTypeObjects,
     operator.SelectType,
+    operator.SelectTypeObjects,
+    operator.UnassignType,
     prop.BIMTypeProperties,
     ui.BIM_PT_type,
 )
diff --git a/src/blenderbim/blenderbim/bim/module/type/operator.py b/src/blenderbim/blenderbim/bim/module/type/operator.py
index bef163ce90..f1130a0a19 100644
--- a/src/blenderbim/blenderbim/bim/module/type/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/type/operator.py
@@ -166,3 +166,19 @@ class SelectTypeObjects(bpy.types.Operator):
             if obj:
                 obj.select_set(True)
         return {"FINISHED"}
+
+
+class RemoveType(bpy.types.Operator, tool.Ifc.Operator):
+    bl_idname = "bim.remove_type"
+    bl_label = "Remove Type"
+    bl_options = {"REGISTER"}
+    element: bpy.props.IntProperty()
+
+    def _execute(self, context):
+        element = tool.Ifc.get().by_id(self.element)
+        obj = tool.Ifc.get_object(element)
+        ifcopenshell.api.run("root.remove_product", tool.Ifc.get(), product=element)
+        if obj:
+            tool.Ifc.unlink(obj=obj)
+            bpy.data.objects.remove(obj)
+        return {"FINISHED"}
diff --git a/src/blenderbim/blenderbim/tool/cad.py b/src/blenderbim/blenderbim/tool/cad.py
index 2c8b17eb0f..9ed290e59a 100644
--- a/src/blenderbim/blenderbim/tool/cad.py
+++ b/src/blenderbim/blenderbim/tool/cad.py
@@ -112,7 +112,7 @@ class Cad:
             p3 = p3.to_3d()
             p4 = p4.to_3d()
         results = mathutils.geometry.intersect_line_line(p1, p2, p3, p4)
-        if is_2d:
+        if is_2d and results:
             r1, r2 = results
             return r1.to_2d() if r1 else r1, r2.to_2d() if r2 else r2
         return results
diff --git a/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py b/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py
index 93224d8c80..4490b0563f 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py
@@ -158,7 +158,6 @@ class Usecase:
             return self.added_elements[element.id()]
         new = self.file.add(element)
         self.added_elements[element.id()] = new
-        self.check_inverses(element)
         for subelement in self.settings["library"].traverse(element):
             self.check_inverses(subelement)
         return new