diff --git a/src/bonsai/bonsai/bim/module/root/operator.py b/src/bonsai/bonsai/bim/module/root/operator.py
index 993d3bfb4b..c7a1f6f02e 100644
--- a/src/bonsai/bonsai/bim/module/root/operator.py
+++ b/src/bonsai/bonsai/bim/module/root/operator.py
@@ -413,12 +413,13 @@ class UnlinkObject(bpy.types.Operator, tool.Ifc.Operator):
     skip_invoke: bpy.props.BoolProperty(default=False, options={"SKIP_SAVE"})
 
     def _execute(self, context):
+        objects: list[bpy.types.Object]
         if self.obj:
-            objects = [bpy.data.objects.get(self.obj)]
+            requested_obj = bpy.data.objects.get(self.obj)
+            objects = [requested_obj] if requested_obj is not None else []
         else:
             objects = context.selected_objects
 
-        objects: list[bpy.types.Object]
         for obj in objects:
             was_active_object = obj == context.active_object
 
diff --git a/src/bonsai/bonsai/tool/sequence.py b/src/bonsai/bonsai/tool/sequence.py
index 2afed8741a..5d51cc451f 100644
--- a/src/bonsai/bonsai/tool/sequence.py
+++ b/src/bonsai/bonsai/tool/sequence.py
@@ -1158,11 +1158,11 @@ class Sequence(bonsai.core.tool.Sequence):
         props.task_input_colors.clear()
         for group, data in groups.items():
             for predefined_type in data["PredefinedType"]:
-                if group in ["CREATION", "OPERATION", "MOVEMENT_TO"]:
+                if group in ("CREATION", "OPERATION", "MOVEMENT_TO"):
                     predefined_type_item = props.task_output_colors.add()
-                elif group in ["MOVEMENT_FROM"]:
+                elif group in ("MOVEMENT_FROM",):
                     predefined_type_item = props.task_input_colors.add()
-                elif group in ["USERDEFINED", "DESTRUCTION"]:
+                elif group in ("USERDEFINED", "DESTRUCTION"):
                     predefined_type_item = props.task_input_colors.add()
                     predefined_type_item2 = props.task_output_colors.add()
                     predefined_type_item2.name = predefined_type
diff --git a/src/ifcopenshell-python/type-check-requirements.txt b/src/ifcopenshell-python/type-check-requirements.txt
index c797c28034..d0cee0bd7e 100644
--- a/src/ifcopenshell-python/type-check-requirements.txt
+++ b/src/ifcopenshell-python/type-check-requirements.txt
@@ -3,6 +3,7 @@ cjio >=0.8, <0.10
 deepdiff
 docutils
 flask
+igraph
 isodate
 jinja2
 lark