diff --git a/src/bonsai/bonsai/bim/module/profile/operator.py b/src/bonsai/bonsai/bim/module/profile/operator.py
index 06c99711d4..f94f711f7d 100644
--- a/src/bonsai/bonsai/bim/module/profile/operator.py
+++ b/src/bonsai/bonsai/bim/module/profile/operator.py
@@ -234,9 +234,15 @@ class EnableEditingArbitraryProfile(bpy.types.Operator):
         props = tool.Profile.get_profile_props()
         active_profile = props.profiles[props.active_profile_index]
         profile_id = active_profile.ifc_definition_id
-        props.active_arbitrary_profile_id = profile_id
         profile = tool.Ifc.get().by_id(profile_id)
-        obj = tool.Model.import_profile(profile)
+
+        try:
+            obj = tool.Model.import_profile(profile)
+        except tool.Model.UnsupportedCurveForConversion as e:
+            self.report({"ERROR"}, str(e))
+            return {"CANCELLED"}
+
+        props.active_arbitrary_profile_id = profile_id
         tool.Ifc.link(profile, obj)
         bpy.context.scene.collection.objects.link(obj)
         tool.Blender.select_and_activate_single_object(context, obj)
diff --git a/src/bonsai/bonsai/tool/model.py b/src/bonsai/bonsai/tool/model.py
index bccb9d4ec3..2a191bde76 100644
--- a/src/bonsai/bonsai/tool/model.py
+++ b/src/bonsai/bonsai/tool/model.py
@@ -486,6 +486,9 @@ class Model(bonsai.core.tool.Model):
 
         return obj
 
+    class UnsupportedCurveForConversion(Exception):
+        pass
+
     @classmethod
     def convert_curve_to_mesh(
         cls,
@@ -550,6 +553,8 @@ class Model(bonsai.core.tool.Model):
             )
             cls.circles.append([offset, offset + 1])
             cls.edges.append((offset, offset + 1))
+        else:
+            raise cls.UnsupportedCurveForConversion(f"Profile has unsupported curve type: {curve}.")
 
     @classmethod
     def import_rectangle(cls, obj: bpy.types.Object, position: Matrix, profile: ifcopenshell.entity_instance) -> None: